Chemical Abundance Analysis of Three α-poor, Metal-poor Stars in the Ultrafaint Dwarf Galaxy Horologium I

Nagasawa, D. Q.; Marshall, J. L.; Li, T. S.; Hansen, T. T.; Simon, J. D.; Bernstein, R. A.; Balbinot, E.; Drlica-Wagner, A.; Pace, A. B.; Strigari, L. E.; Pellegrino, C. M.; DePoy, D. L.; Suntzeff, N. B.; Bechtol, K.; Walker, A. R.; Abbott, T. M.  C.; Abdalla, F. B.; Allam, S.; Annis, J.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; D’Andrea, C. B.; da Costa, L. N.; Davis, C.; Desai, S.; Doel, P.; Eifler, T. F.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Honscheid, K.; James, D. J.; Jeltema, T.; Krause, E.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; March, M.; Miquel, R.; Nord, B.; Roodman, A.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schindler, R.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, M.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; Thomas, D.; Tucker, D. L.; Wechsler, R. H.; Wolf, R. C.; Yanny, B.

doi:10.3847/1538-4357/aaa01d

Title: Chemical Abundance Analysis of Three α-poor, Metal-poor Stars in the Ultrafaint Dwarf Galaxy Horologium I

Journal Article · Thu Jan 11 00:00:00 EST 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aaa01d· OSTI ID:1419983

Nagasawa, D. Q.;

; Li, T. S.;

; Simon, J. D.; Bernstein, R. A.; Balbinot, E.;

; Pace, A. B.;

; Pellegrino, C. M.; DePoy, D. L.; Suntzeff, N. B.; Bechtol, K.;

; Abbott, T. M. C.; Abdalla, F. B.; Allam, S.;

; Benoit-Lévy, A. more »

We present chemical abundance measurements of three stars in the ultra-faintdwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark EnergySurvey. Using high resolution spectroscopic observations we measure themetallicity of the three stars as well as abundance ratios of several$$\alpha$$-elements, iron-peak elements, and neutron-capture elements. Theabundance pattern is relatively consistent among all three stars, which have alow average metallicity of [Fe/H] $$\sim -2.6$$ and are not $$\alpha$$-enhanced([$$\alpha$$/Fe] $$\sim 0.0$$). This result is unexpected when compared to otherlow-metallicity stars in the Galactic halo and other ultra-faint dwarfs andhints at an entirely different mechanism for the enrichment of Hor I comparedto other satellites. We discuss possible scenarios that could lead to thisobserved nucleosynthetic signature including extended star formation, aPopulation III supernova, and a possible association with the Large MagellanicCloud.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); European Union (EU); National Science Foundation (NSF); Ministry of Economic Affairs and Digital Transformation of Spain (MINECO); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: DES Collaboration; DES

Grant/Contract Number:: AC02-76SF00515; AC05-00OR22725; AC02-07CH11359; 240672; 291329; 306478; AYA2015-71825; ESP2015-88861; FPA2015-68048; SEV-2012-0234; SEV-2016-0597; MDM-2015-0509; AST-1138766; AST-1536171

OSTI ID:: 1419983

Alternate ID(s):: OSTI ID: 1422195; OSTI ID: 1422476

Report Number(s):: arXiv:1708.02290; FERMILAB-PUB-17-300-AE; TRN: US1801431

Journal Information:: The Astrophysical Journal (Online), Vol. 852, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 27 works

Citation information provided by
Web of Science

References (154)

IMPROVED LABORATORY TRANSITION PROBABILITIES FOR Ce II, APPLICATION TO THE CERIUM ABUNDANCES OF THE SUN AND FIVE r- PROCESS-RICH, METAL-POOR STARS, AND RARE EARTH LAB DATA SUMMARY Lawler, J. E.; Sneden, C.; Cowan, J. J. The Astrophysical Journal Supplement Series, Vol. 182, Issue 1 https://doi.org/10.1088/0067-0049/182/1/51	journal	April 2009
Improved Laboratory Transition Probabilities for Gd ii and Application to the Gadolinium Abundances of the Sun and Three r ‐Process Rich, Metal‐poor Stars Den Hartog, E. A.; Lawler, J. E.; Sneden, C. The Astrophysical Journal Supplement Series, Vol. 167, Issue 2 https://doi.org/10.1086/508262	journal	December 2006
MIKE: A Double Echelle Spectrograph for the Magellan Telescopes at Las Campanas Observatory Bernstein, Rebecca; Shectman, Stephen A.; Gunnels, Steven M. Astronomical Telescopes and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.461502	conference	March 2003
Atomic Transition Probabilities in Tb ii with Applications to Solar and Stellar Spectra Lawler, J. E.; Wickliffe, M. E.; Cowley, C. R. The Astrophysical Journal Supplement Series, Vol. 137, Issue 2 https://doi.org/10.1086/323001	journal	December 2001
Hyperfine Structure in Tb ii Lawler, J. E.; Wyart, J. ‐F.; Blaise, J. The Astrophysical Journal Supplement Series, Vol. 137, Issue 2 https://doi.org/10.1086/323000	journal	December 2001
Improved Laboratory Transition Parameters for Eu ii and Application to the Solar Europium Elemental and Isotopic Composition Lawler, J. E.; Wickliffe, M. E.; Hartog, E. A. Den The Astrophysical Journal, Vol. 563, Issue 2 https://doi.org/10.1086/323407	journal	December 2001
Design, construction, and performance of UVES, the echelle spectrograph for the UT2 Kueyen Telescope at the ESO Paranal Observatory Dekker, Hans; D'Odorico, Sandro; Kaufer, Andreas Astronomical Telescopes and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.395512	conference	August 2000
The first detailed abundance analysis of Galactic bulge K giants in Baade's window McWilliam, Andrew; Rich, R. Michael The Astrophysical Journal Supplement Series, Vol. 91 https://doi.org/10.1086/191954	journal	March 1994
“Galaxy,” Defined Willman, B.; Strader, J. The Astronomical Journal, Vol. 144, Issue 3 https://doi.org/10.1088/0004-6256/144/3/76	journal	August 2012
Abundance ratios of red giants in low-mass ultra-faint dwarf spheroidal galaxies François, P.; Monaco, L.; Bonifacio, P. Astronomy & Astrophysics, Vol. 588 https://doi.org/10.1051/0004-6361/201527181	journal	March 2016
Satellites of LMC-mass dwarfs: close friendships ruined by Milky Way mass haloes Deason, A. J.; Wetzel, A. R.; Garrison-Kimmel, S. Monthly Notices of the Royal Astronomical Society, Vol. 453, Issue 4 https://doi.org/10.1093/mnras/stv1939	journal	September 2015
Abundance Ratios and Galactic Chemical Evolution McWilliam, Andrew Annual Review of Astronomy and Astrophysics, Vol. 35, Issue 1 https://doi.org/10.1146/annurev.astro.35.1.503	journal	September 1997
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: BoÖTes ii Ji, Alexander P.; Frebel, Anna; Simon, Joshua D. The Astrophysical Journal, Vol. 817, Issue 1 https://doi.org/10.3847/0004-637X/817/1/41	journal	January 2016
Non-LTE calculations for neutral Na in late-type stars using improved atomic data Lind, K.; Asplund, M.; Barklem, P. S. Astronomy & Astrophysics, Vol. 528 https://doi.org/10.1051/0004-6361/201016095	journal	March 2011
The Dartmouth Stellar Evolution Database Dotter, Aaron; Chaboyer, Brian; Jevremović, Darko The Astrophysical Journal Supplement Series, Vol. 178, Issue 1 https://doi.org/10.1086/589654	journal	September 2008
X-shooter GTO: evidence for a population of extremely metal-poor, alpha-poor stars Caffau, E.; Bonifacio, P.; François, P. Astronomy & Astrophysics, Vol. 560 https://doi.org/10.1051/0004-6361/201322213	journal	November 2013
Evidence against dissipation-less dark matter from observations of galaxy haloes Moore, Ben Nature, Vol. 370, Issue 6491 https://doi.org/10.1038/370629a0	journal	August 1994
A chemical signature of first-generation very massive stars Aoki, W.; Tominaga, N.; Beers, T. C. Science, Vol. 345, Issue 6199 https://doi.org/10.1126/science.1252633	journal	August 2014
CH in stellar atmospheres: an extensive linelist Masseron, T.; Plez, B.; Van Eck, S. Astronomy & Astrophysics, Vol. 571 https://doi.org/10.1051/0004-6361/201423956	journal	November 2014
Connecting the First Galaxies with Ultrafaint Dwarfs in the Local Group: Chemical Signatures of Population III Stars Jeon, Myoungwon; Besla, Gurtina; Bromm, Volker The Astrophysical Journal, Vol. 848, Issue 2 https://doi.org/10.3847/1538-4357/aa8c80	journal	October 2017
Tagging the Chemical Evolution History of the Large Magellanic Cloud disk Lapenna, Emilio; Mucciarelli, Alessio; Origlia, Livia The Astrophysical Journal, Vol. 761, Issue 1 https://doi.org/10.1088/0004-637x/761/1/33	journal	November 2012
A Magellanic origin of the DES dwarfs Jethwa, P.; Erkal, D.; Belokurov, V. Monthly Notices of the Royal Astronomical Society, Vol. 461, Issue 2 https://doi.org/10.1093/mnras/stw1343	journal	June 2016
Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the role of Binarity Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P. The Astronomical Journal, Vol. 135, Issue 1 https://doi.org/10.1088/0004-6256/135/1/209	journal	December 2007
Optimal Techniques in Two‐dimensional Spectroscopy: Background Subtraction for the 21st Century Kelson, Daniel D. Publications of the Astronomical Society of the Pacific, Vol. 115, Issue 808 https://doi.org/10.1086/375502	journal	June 2003
The Kinematics of the Ultra‐faint Milky Way Satellites: Solving the Missing Satellite Problem Simon, Joshua D.; Geha, Marla The Astrophysical Journal, Vol. 670, Issue 1 https://doi.org/10.1086/521816	journal	November 2007
Oscillator strength calculations in neutral technetium Palmeri, P.; Fischer, C. F.; Wyart, J. - F. Monthly Notices of the Royal Astronomical Society, Vol. 363, Issue 2 https://doi.org/10.1111/j.1365-2966.2005.09410.x	journal	October 2005
Too big to fail? The puzzling darkness of massive Milky Way subhaloes: Massive dark subhaloes in the Milky Way Boylan-Kolchin, Michael; Bullock, James S.; Kaplinghat, Manoj Monthly Notices of the Royal Astronomical Society: Letters, Vol. 415, Issue 1 https://doi.org/10.1111/j.1745-3933.2011.01074.x	journal	June 2011
Identifying true satellites of the Magellanic Clouds Sales, Laura V.; Navarro, Julio F.; Kallivayalil, Nitya Monthly Notices of the Royal Astronomical Society, Vol. 465, Issue 2 https://doi.org/10.1093/mnras/stw2816	journal	November 2016
Preserving chemical signatures of primordial star formation in the first low-mass stars Ji, Alexander P.; Frebel, Anna; Bromm, Volker Monthly Notices of the Royal Astronomical Society, Vol. 454, Issue 1 https://doi.org/10.1093/mnras/stv2052	journal	September 2015
Near-Field Cosmology with Extremely Metal-Poor Stars Frebel, Anna; Norris, John E. Annual Review of Astronomy and Astrophysics, Vol. 53, Issue 1 https://doi.org/10.1146/annurev-astro-082214-122423	journal	August 2015
Compositions of halo clusters and the formation of the galactic halo Searle, L.; Zinn, R. The Astrophysical Journal, Vol. 225 https://doi.org/10.1086/156499	journal	October 1978
Tracing Galaxy Formation with Stellar Halos. I. Methods Bullock, James S.; Johnston, Kathryn V. The Astrophysical Journal, Vol. 635, Issue 2 https://doi.org/10.1086/497422	journal	December 2005
Gemini/GRACES spectroscopy of stars in Tri II Venn, K. A.; Starkenburg, E.; Malo, L. Monthly Notices of the Royal Astronomical Society, Vol. 466, Issue 3 https://doi.org/10.1093/mnras/stw3198	journal	December 2016
Uncovering the Chemical Signature of the First Stars in the Universe Karlsson, Torgny; Johnson, Jarrett L.; Bromm, Volker The Astrophysical Journal, Vol. 679, Issue 1 https://doi.org/10.1086/533520	journal	May 2008
Tracing Galaxy Formation with Stellar Halos. II. Relating Substructure in Phase and Abundance Space to Accretion Histories Johnston, Kathryn V.; Bullock, James S.; Sharma, Sanjib The Astrophysical Journal, Vol. 689, Issue 2 https://doi.org/10.1086/592228	journal	December 2008
Improved Laboratory Transition Probabilities for Nd ii and Application to the Neodymium Abundances of the Sun and Three Metal‐poor Stars Den Hartog, E. A.; Lawler, J. E.; Sneden, C. The Astrophysical Journal Supplement Series, Vol. 148, Issue 2 https://doi.org/10.1086/376940	journal	October 2003
Improved Laboratory Transition Probabilities for Neutral Chromium and Redetermination of the Chromium Abundance for the Sun and Three Stars Sobeck, Jennifer S.; Lawler, James E.; Sneden, Christopher The Astrophysical Journal, Vol. 667, Issue 2 https://doi.org/10.1086/519987	journal	October 2007
Chemical compositions of six metal-poor stars in the ultra-faint dwarf spheroidal galaxy Boötes I Ishigaki, M. N.; Aoki, W.; Arimoto, N. Astronomy & Astrophysics, Vol. 562 https://doi.org/10.1051/0004-6361/201322796	journal	February 2014
The Abundances of Neutron-Capture Species in the very Metal-Poor Globular Cluster m15: a Uniform Analysis of red Giant Branch and red Horizontal Branch Stars Sobeck, Jennifer S.; Kraft, Robert P.; Sneden, Christopher The Astronomical Journal, Vol. 141, Issue 6 https://doi.org/10.1088/0004-6256/141/6/175	journal	April 2011
Chemical abundances in LMC stellar populations: II. The bar sample⋆⋆⋆⋆⋆⋆ Van der Swaelmen, M.; Hill, V.; Primas, F. Astronomy & Astrophysics, Vol. 560 https://doi.org/10.1051/0004-6361/201321109	journal	December 2013
Galactic Archaeology: The dwarfs that survived and perished Belokurov, Vasily New Astronomy Reviews, Vol. 57, Issue 3-4 https://doi.org/10.1016/j.newar.2013.07.001	journal	September 2013
IMPROVED log( gf ) VALUES FOR LINES OF Ti I AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 (ACCURATE TRANSITION PROBABILITIES FOR Ti I) Lawler, J. E.; Guzman, A.; Wood, M. P. The Astrophysical Journal Supplement Series, Vol. 205, Issue 2 https://doi.org/10.1088/0067-0049/205/2/11	journal	March 2013
IMPROVED Ni I log( gf ) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 Wood, M. P.; Lawler, J. E.; Sneden, C. The Astrophysical Journal Supplement Series, Vol. 211, Issue 2 https://doi.org/10.1088/0067-0049/211/2/20	journal	March 2014
The Discovery and Analysis of Very Metal-Poor Stars in the Galaxy Beers, Timothy C.; Christlieb, Norbert Annual Review of Astronomy and Astrophysics, Vol. 43, Issue 1 https://doi.org/10.1146/annurev.astro.42.053102.134057	journal	September 2005
Including all the lines ¹ This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas. Kurucz, Robert L. Canadian Journal of Physics, Vol. 89, Issue 4 https://doi.org/10.1139/p10-104	journal	April 2011
NEW RARE EARTH ELEMENT ABUNDANCE DISTRIBUTIONS FOR THE SUN AND FIVE r -PROCESS-RICH VERY METAL-POOR STARS Sneden, Christopher; Lawler, James E.; Cowan, John J. The Astrophysical Journal Supplement Series, Vol. 182, Issue 1 https://doi.org/10.1088/0067-0049/182/1/80	journal	April 2009
Iron-Group Abundances in the Metal-Poor Main-Sequence Turnoff star hd 84937 Sneden, Christopher; Cowan, John J.; Kobayashi, Chiaki The Astrophysical Journal, Vol. 817, Issue 1 https://doi.org/10.3847/0004-637X/817/1/53	journal	January 2016
LINE LISTS FOR THE A ² Π- X ² Σ ⁺ (RED) AND B ² Σ ⁺ - X ² Σ ⁺ (VIOLET) SYSTEMS OF CN, ¹³ C ¹⁴ N, AND ¹² C ¹⁵ N, AND APPLICATION TO ASTRONOMICAL SPECTRA Sneden, Christopher; Lucatello, Sara; Ram, Ram S. The Astrophysical Journal Supplement Series, Vol. 214, Issue 2 https://doi.org/10.1088/0067-0049/214/2/26	journal	October 2014
Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum ii Simon, J. D.; Drlica-Wagner, A.; Li, T. S. The Astrophysical Journal, Vol. 808, Issue 1 https://doi.org/10.1088/0004-637X/808/1/95	journal	July 2015
Digging deeper into the Southern skies: a compact Milky Way companion discovered in first-year Dark Energy Survey data Luque, E.; Queiroz, A.; Santiago, B. Monthly Notices of the Royal Astronomical Society, Vol. 458, Issue 1 https://doi.org/10.1093/mnras/stw302	journal	February 2016
Discovery of an "alpha" Element-Poor Halo Star in a Search for Very Low- Metallicity Disk Stars Carney, Bruce W.; Wright, Jeffrey S.; Sneden, Chris The Astronomical Journal, Vol. 114 https://doi.org/10.1086/118480	journal	July 1997
Experimental Radiative Lifetimes, Branching Fractions, and Oscillator Strengths for La ii and a New Determination of the Solar Lanthanum Abundance Lawler, J. E.; Bonvallet, G.; Sneden, Christopher The Astrophysical Journal, Vol. 556, Issue 1 https://doi.org/10.1086/321549	journal	July 2001
IMPROVED Co i log( gf ) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 Lawler, J. E.; Sneden, C.; Cowan, J. J. The Astrophysical Journal Supplement Series, Vol. 220, Issue 1 https://doi.org/10.1088/0067-0049/220/1/13	journal	September 2015
The Chemical Composition of the Sun Asplund, Martin; Grevesse, Nicolas; Sauval, A. Jacques Annual Review of Astronomy and Astrophysics, Vol. 47, Issue 1 https://doi.org/10.1146/annurev.astro.46.060407.145222	journal	September 2009
Improved Laboratory Transition Probabilities for Sm ii and Application to the Samarium Abundances of the Sun and Three r ‐Process–rich, Metal‐poor Stars Lawler, J. E.; Den Hartog, E. A.; Sneden, C. The Astrophysical Journal Supplement Series, Vol. 162, Issue 1 https://doi.org/10.1086/498213	journal	January 2006
Absolute transition probabilities in Sc i and Sc ii Lawler, J. E.; Dakin, J. T. Journal of the Optical Society of America B, Vol. 6, Issue 8 https://doi.org/10.1364/JOSAB.6.001457	journal	January 1989
Detailed abundance analysis of the brightest star in Segue 2, the least massive galaxy★ Roederer, Ian U.; Kirby, Evan N. Monthly Notices of the Royal Astronomical Society, Vol. 440, Issue 3 https://doi.org/10.1093/mnras/stu491	journal	April 2014
Complexity on Small Scales. iii. iron and α Element Abundances in the Carina Dwarf Spheroidal Galaxy Koch, Andreas; Grebel, Eva K.; Gilmore, Gerard F. The Astronomical Journal, Vol. 135, Issue 4 https://doi.org/10.1088/0004-6256/135/4/1580	journal	March 2008
Stellar lifetimes and abundance ratios in chemical evolution Tinsley, B. M. The Astrophysical Journal, Vol. 229 https://doi.org/10.1086/157039	journal	May 1979
Chemical abundances in LMC stellar populations: I. The inner disk sample Pompéia, L.; Hill, V.; Spite, M. Astronomy & Astrophysics, Vol. 480, Issue 2 https://doi.org/10.1051/0004-6361:20064854	journal	January 2008
Triangulum II. Not Especially Dense After All Kirby, Evan N.; Cohen, Judith G.; Simon, Joshua D. The Astrophysical Journal, Vol. 838, Issue 2 https://doi.org/10.3847/1538-4357/aa6570	journal	March 2017
Neutron-capture element deficiency of the Hercules dwarf spheroidal galaxy Koch, A.; Feltzing, S.; Adén, D. Astronomy & Astrophysics, Vol. 554 https://doi.org/10.1051/0004-6361/201220742	journal	May 2013
Where Are the Missing Galactic Satellites? Klypin, Anatoly; Kravtsov, Andrey V.; Valenzuela, Octavio The Astrophysical Journal, Vol. 522, Issue 1 https://doi.org/10.1086/307643	journal	September 1999
The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates Luque, E.; Pieres, A.; Santiago, B. Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 1 https://doi.org/10.1093/mnras/stx405	journal	February 2017
Oscillator strengths for Zr I and Zr II and a new determination of the solar abundance of zirconium Biemont, E.; Grevesse, N.; Hannaford, P. The Astrophysical Journal, Vol. 248 https://doi.org/10.1086/159213	journal	September 1981
Forming the First Stars in the Universe: The Fragmentation of Primordial Gas Bromm, Volker; Coppi, Paolo S.; Larson, Richard B. The Astrophysical Journal, Vol. 527, Issue 1 https://doi.org/10.1086/312385	journal	December 1999
The Highly Unusual Chemical Composition of the Hercules Dwarf Spheroidal Galaxy Koch, Andreas; McWilliam, Andrew; Grebel, Eva K. The Astrophysical Journal, Vol. 688, Issue 1 https://doi.org/10.1086/595001	journal	November 2008
The Field of Streams: Sagittarius and Its Siblings Belokurov, V.; Zucker, D. B.; Evans, N. W. The Astrophysical Journal, Vol. 642, Issue 2 https://doi.org/10.1086/504797	journal	April 2006
Λ Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern Robertson, Brant; Bullock, James S.; Font, Andreea S. The Astrophysical Journal, Vol. 632, Issue 2 https://doi.org/10.1086/452619	journal	October 2005
DETAILED CHEMICAL ABUNDANCES IN THE r -PROCESS-RICH ULTRA-FAINT DWARF GALAXY RETICULUM 2 Roederer, Ian U.; Mateo, Mario; Iii, John I. Bailey The Astronomical Journal, Vol. 151, Issue 3 https://doi.org/10.3847/0004-6256/151/3/82	journal	February 2016
Lifetime measurements and calculations in Y+ and Y2+ ions: Lifetimes in Y+ and Y2+ ions Biémont, É.; Blagoev, K.; Engström, L. Monthly Notices of the Royal Astronomical Society, Vol. 414, Issue 4 https://doi.org/10.1111/j.1365-2966.2011.18637.x	journal	May 2011
The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization era Brown, Thomas M.; Tumlinson, Jason; Geha, Marla The Astrophysical Journal, Vol. 796, Issue 2 https://doi.org/10.1088/0004-637X/796/2/91	journal	November 2014
Fe i oscillator strengths for the Gaia-ESO survey Ruffoni, M. P.; Den Hartog, E. A.; Lawler, J. E. Monthly Notices of the Royal Astronomical Society, Vol. 441, Issue 4 https://doi.org/10.1093/mnras/stu780	journal	May 2014
IMPROVED V I log( gf ) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 Lawler, J. E.; Wood, M. P.; Den Hartog, E. A. The Astrophysical Journal Supplement Series, Vol. 215, Issue 2 https://doi.org/10.1088/0067-0049/215/2/20	journal	January 2014
New Extremely Metal‐Poor Stars in the Galactic Halo Cohen, Judith G.; Christlieb, Norbert; McWilliam, Andrew The Astrophysical Journal, Vol. 672, Issue 1 https://doi.org/10.1086/523638	journal	January 2008
Stellar archaeology: Exploring the Universe with metal-poor stars Frebel, A. Astronomische Nachrichten, Vol. 331, Issue 5 https://doi.org/10.1002/asna.201011362	journal	May 2010
FLAMES: a multi-object fiber facility for the VLT Pasquini, Luca; Avila, Gerardo; Allaert, Eric Astronomical Telescopes and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.395491	conference	August 2000
The nitrogen abundance of the very metal-poor star HD 122563. Sneden, C. The Astrophysical Journal, Vol. 184 https://doi.org/10.1086/152374	journal	September 1973
Kinematics and Chemistry of Recently Discovered Reticulum 2 and Horologium 1 Dwarf Galaxies Koposov, Sergey E.; Casey, Andrew R.; Belokurov, Vasily The Astrophysical Journal, Vol. 811, Issue 1 https://doi.org/10.1088/0004-637x/811/1/62	journal	September 2015
R-process enrichment from a single event in an ancient dwarf galaxy Ji, Alexander P.; Frebel, Anna; Chiti, Anirudh Nature, Vol. 531, Issue 7596 https://doi.org/10.1038/nature17425	journal	March 2016
Neutron-Capture Elements in the Early Galaxy Sneden, Christopher; Cowan, John J.; Gallino, Roberto Annual Review of Astronomy and Astrophysics, Vol. 46, Issue 1 https://doi.org/10.1146/annurev.astro.46.060407.145207	journal	September 2008
IMPROVED log( gf ) VALUES OF SELECTED LINES IN Mn I AND Mn II FOR ABUNDANCE DETERMINATIONS IN FGK DWARFS AND GIANTS Den Hartog, E. A.; Lawler, J. E.; Sobeck, J. S. The Astrophysical Journal Supplement Series, Vol. 194, Issue 2 https://doi.org/10.1088/0067-0049/194/2/35	journal	May 2011
The Observed Properties of Dwarf Galaxies in and Around the Local Group McConnachie, Alan W. The Astronomical Journal, Vol. 144, Issue 1 https://doi.org/10.1088/0004-6256/144/1/4	journal	June 2012
The Nucleosynthetic Signature of Population III Heger, A.; Woosley, S. E. The Astrophysical Journal, Vol. 567, Issue 1 https://doi.org/10.1086/338487	journal	March 2002
Nearest Neighbor: The Low-mass Milky Way Satellite Tucana III Simon, J. D.; Li, T. S.; Drlica-Wagner, A. The Astrophysical Journal, Vol. 838, Issue 1 https://doi.org/10.3847/1538-4357/aa5be7	journal	March 2017
Chemical Substructure in the Milky Way Halo: A New Population of Old Stars Ivans, Inese I.; Sneden, Christopher; James, C. Renee The Astrophysical Journal, Vol. 592, Issue 2 https://doi.org/10.1086/375812	journal	August 2003
Atomic transition probabilities in RuI Wickliffe, M. E.; Salih, S.; Lawler, J. E. Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 51, Issue 4 https://doi.org/10.1016/0022-4073(94)90108-2	journal	April 1994
Improved Laboratory Transition Probabilities for Er ii and Application to the Erbium Abundances of the Sun and Five r ‐Process‐rich, Metal‐poor Stars Lawler, J. E.; Sneden, C.; Cowan, J. J. The Astrophysical Journal Supplement Series, Vol. 178, Issue 1 https://doi.org/10.1086/589834	journal	September 2008
Stellar Chemical Signatures and Hierarchical Galaxy Formation Venn, Kim A.; Irwin, Mike; Shetrone, Matthew D. The Astronomical Journal, Vol. 128, Issue 3 https://doi.org/10.1086/422734	journal	September 2004
The barium isotopic mixture for the metal-poor subgiant star HD 140283 Gallagher, A. J.; Ryan, S. G.; García Pérez, A. E. Astronomy & Astrophysics, Vol. 523 https://doi.org/10.1051/0004-6361/201014970	journal	November 2010
Chemical Abundances of Metal-Poor rr Lyrae Stars in the Magellanic Clouds Haschke, Raoul; Grebel, Eva K.; Frebel, Anna The Astronomical Journal, Vol. 144, Issue 3 https://doi.org/10.1088/0004-6256/144/3/88	journal	August 2012
An r -process Enhanced Star in the Dwarf Galaxy Tucana III Hansen, T. T.; Simon, J. D.; Marshall, J. L. The Astrophysical Journal, Vol. 838, Issue 1 https://doi.org/10.3847/1538-4357/aa634a	journal	March 2017
A Search for Stars of very low Metal Abundance. vi. Detailed Abundances of 313 Metal-Poor Stars Roederer, Ian U.; Preston, George W.; Thompson, Ian B. The Astronomical Journal, Vol. 147, Issue 6 https://doi.org/10.1088/0004-6256/147/6/136	journal	May 2014
Farthest Neighbor: The Distant Milky Way Satellite Eridanus II Li, T. S.; Simon, J. D.; Drlica-Wagner, A. The Astrophysical Journal, Vol. 838, Issue 1 https://doi.org/10.3847/1538-4357/aa6113	journal	March 2017
Eight new Milky way Companions Discovered in First-Year dark Energy Survey data Bechtol, K.; Drlica-Wagner, A.; Balbinot, E. The Astrophysical Journal, Vol. 807, Issue 1 https://doi.org/10.1088/0004-637X/807/1/50	journal	June 2015
The NACRE thermonuclear reaction compilation and big bang nucleosynthesis Cyburt, R. New Astronomy, Vol. 6, Issue 4 https://doi.org/10.1016/S1384-1076(01)00053-7	journal	June 2001
Eight Ultra-Faint Galaxy Candidates Discovered in year two of the dark Energy Survey Drlica-Wagner, A.; Bechtol, K.; Rykoff, E. S. The Astrophysical Journal, Vol. 813, Issue 2 https://doi.org/10.1088/0004-637X/813/2/109	journal	November 2015
Chemical Signatures of the First Galaxies: Criteria for One-Shot Enrichment Frebel, Anna; Bromm, Volker The Astrophysical Journal, Vol. 759, Issue 2 https://doi.org/10.1088/0004-637X/759/2/115	journal	October 2012
Deriving Stellar Effective Temperatures of Metal-Poor Stars with the Excitation Potential Method Frebel, Anna; Casey, Andrew R.; Jacobson, Heather R. The Astrophysical Journal, Vol. 769, Issue 1 https://doi.org/10.1088/0004-637X/769/1/57	journal	May 2013
The Chemical Evolution of the BoÖTes i Ultra-Faint Dwarf Galaxy Frebel, Anna; Norris, John E.; Gilmore, Gerard The Astrophysical Journal, Vol. 826, Issue 2 https://doi.org/10.3847/0004-637X/826/2/110	journal	July 2016
HIGH-RESOLUTION SPECTROSCOPY OF EXTREMELY METAL-POOR STARS IN THE LEAST EVOLVED GALAXIES: URSA MAJOR II and COMA BERENICES Frebel, Anna; Simon, Joshua D.; Geha, Marla The Astrophysical Journal, Vol. 708, Issue 1 https://doi.org/10.1088/0004-637X/708/1/560	journal	December 2009
Segue 1: an Unevolved Fossil Galaxy from the Early Universe Frebel, Anna; Simon, Joshua D.; Kirby, Evan N. The Astrophysical Journal, Vol. 786, Issue 1 https://doi.org/10.1088/0004-637X/786/1/74	journal	April 2014
Elemental Abundances and Their Implications for the Chemical Enrichment of the BoÖTes i Ultrafaint Galaxy Gilmore, Gerard; Norris, John E.; Monaco, Lorenzo The Astrophysical Journal, Vol. 763, Issue 1 https://doi.org/10.1088/0004-637X/763/1/61	journal	January 2013
Nucleosynthesis and Evolution of Massive Metal-Free Stars Heger, Alexander; Woosley, S. E. The Astrophysical Journal, Vol. 724, Issue 1 https://doi.org/10.1088/0004-637X/724/1/341	journal	November 2010
The Metal-Poor knee in the Fornax Dwarf Spheroidal Galaxy Hendricks, Benjamin; Koch, Andreas; Lanfranchi, Gustavo A. The Astrophysical Journal, Vol. 785, Issue 2 https://doi.org/10.1088/0004-637X/785/2/102	journal	April 2014
Chemical Diversity in the Ultra-Faint Dwarf Galaxy Tucana ii Ji, Alexander P.; Frebel, Anna; Ezzeddine, Rana The Astrophysical Journal, Vol. 832, Issue 1 https://doi.org/10.3847/2041-8205/832/1/L3	journal	November 2016
COMPLETE ELEMENT ABUNDANCES OF NINE STARS IN THE r -PROCESS GALAXY RETICULUM II Ji, Alexander P.; Frebel, Anna; Simon, Joshua D. The Astrophysical Journal, Vol. 830, Issue 2 https://doi.org/10.3847/0004-637X/830/2/93	journal	October 2016
Horologium ii: a Second Ultra-Faint Milky way Satellite in the Horologium Constellation Kim, Dongwon; Jerjen, Helmut The Astrophysical Journal, Vol. 808, Issue 2 https://doi.org/10.1088/2041-8205/808/2/L39	journal	July 2015
Discovery of a Faint Outer halo Milky way star Cluster in the Southern sky Kim, Dongwon; Jerjen, Helmut; Milone, Antonino P. The Astrophysical Journal, Vol. 803, Issue 2 https://doi.org/10.1088/0004-637X/803/2/63	journal	April 2015
Multi-Element Abundance Measurements from Medium-Resolution Spectra. iv. Alpha Element Distributions in Milky way Satellite Galaxies Kirby, Evan N.; Cohen, Judith. G.; Smith, Graeme H. The Astrophysical Journal, Vol. 727, Issue 2 https://doi.org/10.1088/0004-637X/727/2/79	journal	January 2011
Multi-Element Abundance Measurements from Medium-Resolution Spectra. i. the Sculptor Dwarf Spheroidal Galaxy Kirby, Evan N.; Guhathakurta, Puragra; Bolte, Michael The Astrophysical Journal, Vol. 705, Issue 1 https://doi.org/10.1088/0004-637X/705/1/328	journal	October 2009
Beasts of the Southern Wild: Discovery of nine Ultra Faint Satellites in the Vicinity of the Magellanic Clouds Koposov, Sergey E.; Belokurov, Vasily; Torrealba, Gabriel The Astrophysical Journal, Vol. 805, Issue 2 https://doi.org/10.1088/0004-637X/805/2/130	journal	May 2015
Chemical Enrichment in the Faintest Galaxies: the Carbon and iron Abundance Spreads in the BoÖTes i Dwarf Spheroidal Galaxy and the Segue 1 System Norris, John E.; Wyse, Rosemary F. G.; Gilmore, Gerard The Astrophysical Journal, Vol. 723, Issue 2 https://doi.org/10.1088/0004-637X/723/2/1632	journal	October 2010
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: leo iv Simon, Joshua D.; Frebel, Anna; McWilliam, Andrew The Astrophysical Journal, Vol. 716, Issue 1 https://doi.org/10.1088/0004-637X/716/1/446	journal	May 2010
Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy Simon, Joshua D.; Jacobson, Heather R.; Frebel, Anna The Astrophysical Journal, Vol. 802, Issue 2 https://doi.org/10.1088/0004-637X/802/2/93	journal	March 2015
The Distribution of Alpha Elements in Ultra-Faint Dwarf Galaxies Vargas, Luis C.; Geha, Marla; Kirby, Evan N. The Astrophysical Journal, Vol. 767, Issue 2 https://doi.org/10.1088/0004-637X/767/2/134	journal	April 2013
Magellan/M2fs Spectroscopy of Tucana 2 and grus 1 Walker, Matthew G.; Mateo, Mario; Olszewski, Edward W. The Astrophysical Journal, Vol. 819, Issue 1 https://doi.org/10.3847/0004-637X/819/1/53	journal	February 2016
Satellite Dwarf Galaxies in a Hierarchical Universe: Infall Histories, Group Preprocessing, and Reionization Wetzel, Andrew R.; Deason, Alis J.; Garrison-Kimmel, Shea The Astrophysical Journal, Vol. 807, Issue 1 https://doi.org/10.1088/0004-637X/807/1/49	journal	June 2015
Atomic transition probabilities for Dy I and Dy II Wickliffe, M. E.; Lawler, J. E.; Nave, G. Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 66, Issue 4 https://doi.org/10.1016/S0022-4073(99)00173-9	journal	August 2000
THE MOST METAL-POOR STARS. II. CHEMICAL ABUNDANCES OF 190 METAL-POOR STARS INCLUDING 10 NEW STARS WITH [Fe/H] ⩽ –3.5, , Yong, David; Norris, John E.; Bessell, M. S. The Astrophysical Journal, Vol. 762, Issue 1 https://doi.org/10.1088/0004-637X/762/1/26	journal	December 2012
Atomic transition probabilities for Dy I and Dy II Nave, G.; Wickliffe, M. E.; Lawler, J. E. IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th International Conference, IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297) https://doi.org/10.1109/plasma.1999.829563	conference	January 1999
The Chemical Evolution of the Bootes i Ultra-Faint Dwarf Galaxy Frebel, Anna; Norris, John E.; Gilmore, Gerard Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.27917	text	January 2016
Chemical Substructure in the Milky Way Halo: A New Population of Old Stars Inese, Ivans,; George, Preston,; Christopher, Sneden, The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/5cg9-v994	text	January 2003
Improved Laboratory Transition Probabilities for Neutral Chromium and Re-determination of the Chromium Abundance for the Sun and Three Stars Sobeck, Jennifer S.; Lawler, James E.; Sneden, Christopher arXiv https://doi.org/10.48550/arxiv.0707.4603	text	January 2007
New Extremely Metal-Poor Stars in the Galactic Halo Cohen, Judith G.; Christlieb, Norbert; McWilliam, Andrew arXiv https://doi.org/10.48550/arxiv.0709.0029	text	January 2007
Improved Laboratory Transition Probabilities for Er II and Applications to the Erbium Abundances of the Sun and Five r-Process Rich, Metal-Poor Stars Lawler, J. E.; Sneden, C.; Cowan, J. J. arXiv https://doi.org/10.48550/arxiv.0804.4465	text	January 2008
The Dartmouth Stellar Evolution Database Dotter, Aaron; Chaboyer, Brian; Jevremovic, Darko arXiv https://doi.org/10.48550/arxiv.0804.4473	text	January 2008
The Highly Unusual Chemical Composition of the Hercules Dwarf Spheroidal Galaxy Koch, A.; McWilliam, A.; Grebel, E. K. arXiv https://doi.org/10.48550/arxiv.0810.0710	text	January 2008
High-Resolution Spectroscopy of Extremely Metal-Poor Stars in the Least Evolved Galaxies: Ursa Major II and Coma Berenices Frebel, Anna; Simon, Joshua D.; Geha, Marla arXiv https://doi.org/10.48550/arxiv.0902.2395	text	January 2009
Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1006.2419	text	January 2010
Chemical Signatures of the First Galaxies: Criteria for One-Shot Enrichment Frebel, Anna; Bromm, Volker arXiv https://doi.org/10.48550/arxiv.1010.1261	text	January 2010
"Galaxy," Defined Willman, Beth; Strader, Jay arXiv https://doi.org/10.48550/arxiv.1203.2608	text	January 2012
Chemical abundances of metal-poor RR Lyrae stars in the Magellanic Clouds Haschke, Raoul; Grebel, Eva K.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1206.4999	text	January 2012
Tagging the Chemical Evolution History of the Large Magellanic Cloud Disk Lapenna, Emilio; Mucciarelli, Alessio; Origlia, Livia arXiv https://doi.org/10.48550/arxiv.1210.0560	text	January 2012
Neutron-capture element deficiency of the Hercules dwarf spheroidal galaxy Koch, Andreas; Feltzing, Sofia; Aden, Daniel arXiv https://doi.org/10.48550/arxiv.1304.2764	text	January 2013
Chemical abundances in LMC stellar populations. II. The bar sample Van der Swaelmen, M.; Hill, V.; Primas, F. arXiv https://doi.org/10.48550/arxiv.1306.4224	text	January 2013
X-Shooter GTO: evidence for a population of extremely metal-poor, alpha-poor stars Caffau, E.; Bonifacio, P.; Francois, P. arXiv https://doi.org/10.48550/arxiv.1309.4913	text	January 2013
The metal-poor Knee in the Fornax Dwarf Spheroidal Galaxy Hendricks, Benjamin; Koch, Andreas; Lanfranchi, Gustavo A. arXiv https://doi.org/10.48550/arxiv.1402.6328	text	January 2014
Detailed Abundance Analysis of the Brightest Star in Segue 2, the Least Massive Galaxy Roederer, Ian U.; Kirby, Evan N. arXiv https://doi.org/10.48550/arxiv.1403.2733	text	January 2014
A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars Roederer, Ian U.; Preston, George W.; Thompson, Ian B. arXiv https://doi.org/10.48550/arxiv.1403.6853	text	January 2014
The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era Brown, Thomas M.; Tumlinson, Jason; Geha, Marla arXiv https://doi.org/10.48550/arxiv.1410.0681	text	January 2014
CH in stellar atmospheres: an extensive linelist Masseron, T.; Plez, B.; Van Eck, S. arXiv https://doi.org/10.48550/arxiv.1410.4005	text	January 2014
Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy Simon, Joshua D.; Jacobson, Heather R.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1412.5176	text	January 2014
Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum II Simon, J. D.; Drlica-Wagner, A.; Li, T. S. arXiv https://doi.org/10.48550/arxiv.1504.02889	text	January 2015
Digging deeper into the Southern skies: a compact Milky-Way companion discovered in first-year Dark Energy Survey data Luque, E.; Queiroz, A.; Santiago, B. arXiv https://doi.org/10.48550/arxiv.1508.02381	text	January 2015
Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey Collaboration, The DES; Drlica-Wagner, A.; Bechtol, K. arXiv https://doi.org/10.48550/arxiv.1508.03622	text	January 2015
Magellan/M2FS Spectroscopy of Tucana 2 and Grus 1 Walker, Matthew G.; Mateo, Mario; Olszewski, Edward W. arXiv https://doi.org/10.48550/arxiv.1511.06296	text	January 2015
Identifying true satellites of the Magellanic Clouds Sales, Laura V.; Navarro, Julio F.; Kallivayalil, Nitya arXiv https://doi.org/10.48550/arxiv.1605.03574	text	January 2016
Complete element abundances of nine stars in the r-process galaxy Reticulum II Ji, Alexander P.; Frebel, Anna; Simon, Joshua D. arXiv https://doi.org/10.48550/arxiv.1607.07447	text	January 2016
Chemical Diversity in the Ultra-faint Dwarf Galaxy Tucana II Ji, Alexander P.; Frebel, Anna; Ezzeddine, Rana arXiv https://doi.org/10.48550/arxiv.1609.02915	text	January 2016
Farthest Neighbor: The Distant Milky Way Satellite Eridanus II Li, T. S.; Simon, J. D.; Drlica-Wagner, A. arXiv https://doi.org/10.48550/arxiv.1611.05052	text	January 2016
Connecting the first galaxies with ultra faint dwarfs in the Local Group: chemical signatures of Population~III stars Jeon, Myoungwon; Besla, Gurtina; Bromm, Volker arXiv https://doi.org/10.48550/arxiv.1702.07355	text	January 2017
An R-process enhanced star in the dwarf galaxy Tucana III Hansen, T. T.; Simon, J. D.; Marshall, J. L. arXiv https://doi.org/10.48550/arxiv.1702.07430	text	January 2017
Where are the missing galactic satellites? Klypin, Anatoly A.; Kravtsov, Andrey V.; Valenzuela, Octavio arXiv https://doi.org/10.48550/arxiv.astro-ph/9901240	text	January 1999

Cited By (11)

Gaia Proper Motions and Orbits of the Ultra-faint Milky Way Satellites Simon, Joshua D. The Astrophysical Journal, Vol. 863, Issue 1 https://doi.org/10.3847/1538-4357/aacdfb	journal	August 2018
High-resolution Optical Spectroscopy of Stars in the Sylgr Stellar Stream Roederer, Ian U.; Gnedin, Oleg Y. The Astrophysical Journal, Vol. 883, Issue 1 https://doi.org/10.3847/1538-4357/ab365c	journal	September 2019
Chemical Abundances in the Ultra-faint Dwarf Galaxies Grus I and Triangulum II: Neutron-capture Elements as a Defining Feature of the Faintest Dwarfs Ji, Alexander P.; Simon, Joshua D.; Frebel, Anna The Astrophysical Journal, Vol. 870, Issue 2 https://doi.org/10.3847/1538-4357/aaf3bb	journal	January 2019
The Origin of r -process Enhanced Metal-poor Halo Stars In Now-destroyed Ultra-faint Dwarf Galaxies Brauer, Kaley; Ji, Alexander P.; Frebel, Anna The Astrophysical Journal, Vol. 871, Issue 2 https://doi.org/10.3847/1538-4357/aafafb	journal	February 2019
Chemical Abundance Analysis of Tucana III, the Second r -process Enhanced Ultra-faint Dwarf Galaxy Marshall, J. L.; Hansen, T.; Simon, J. D. The Astrophysical Journal, Vol. 882, Issue 2 https://doi.org/10.3847/1538-4357/ab3653	journal	September 2019
Chemical Abundances of New Member Stars in the Tucana II Dwarf Galaxy Chiti, Anirudh; Frebel, Anna; Ji, Alexander P. The Astrophysical Journal, Vol. 857, Issue 1 https://doi.org/10.3847/1538-4357/aab4fc	journal	April 2018
Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III Ji, A. P.; Li, T. S.; Simon, J. D. The Astrophysical Journal, Vol. 889, Issue 1 https://doi.org/10.3847/1538-4357/ab6213	journal	January 2020
Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1 Pace, Andrew B.; Li, Ting S. The Astrophysical Journal, Vol. 875, Issue 1 https://doi.org/10.3847/1538-4357/ab0aee	journal	April 2019
The R -Process Alliance: Discovery of a Low- α , r -process-enhanced Metal-poor Star in the Galactic Halo Sakari, Charli M.; Roederer, Ian U.; Placco, Vinicius M. The Astrophysical Journal, Vol. 874, Issue 2 https://doi.org/10.3847/1538-4357/ab0c02	journal	April 2019
Chemical Abundances of new member stars in the Tucana II dwarf galaxy Chiti, Anirudh; Frebel, Anna; Ji, Alexander P. arXiv https://doi.org/10.48550/arxiv.1803.01808	text	January 2018
Chemical Abundances in the Ultra-Faint Dwarf Galaxies Grus I and Triangulum II: Neutron-Capture Elements as a Defining Feature of the Faintest Dwarfs Ji, Alexander P.; Simon, Joshua D.; Frebel, Anna arXiv https://doi.org/10.48550/arxiv.1809.02182	text	January 2018