The detailed chemical abundance patterns of accreted halo stars from the optical to infrared

Carrillo, Andreia; Hawkins, Keith; Jofré, Paula; de Brito Silva, Danielle; Das, Payel; Lucey, Madeline

doi:10.1093/mnras/stac518

Title: The detailed chemical abundance patterns of accreted halo stars from the optical to infrared

Journal Article · 27 April 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac518 · OSTI ID:1866523

Carrillo, Andreia;

; Jofré, Paula; de Brito Silva, Danielle; Das, Payel;

ABSTRACT Understanding the assembly of our Galaxy requires us to also characterize the systems that helped build it. In this work, we accomplish this by exploring the chemistry of accreted halo stars from Gaia-Enceladus/Gaia-Sausage (GES) selected in the infrared from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) Data Release 16. We use high resolution optical spectra for 62 GES stars to measure abundances in 20 elements spanning the α, Fe-peak, light, odd-Z, and notably, the neutron-capture groups of elements to understand their trends in the context of and in contrast to the Milky Way and other stellar populations. Using these derived abundances we find that the optical and the infrared abundances agree to within 0.15 dex except for O, Co, Na, Cu, and Ce. These stars have enhanced neutron-capture abundance trends compared to the Milky Way, and their [Eu/Mg] and neutron-capture abundance ratios (e.g. [Y/Eu], [Ba/Eu], [Zr/Ba], [La/Ba], and [Nd/Ba]) point to r-process enhancement and a delay in s-process enrichment. Their [α/Fe] trend is lower than the Milky Way trend for [Fe/H] > −1.5 dex, similar to previous studies of GES stars and consistent with the picture that these stars formed in a system with a lower rate of star formation. This is further supported by their depleted abundances in Ni, Na, and Cu abundances, again, similar to previous studies of low-α stars with accreted origins.

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Research Organization:: University of Texas, Austin, TX (United States)

Sponsoring Organization:: Brinson Foundation; Heising–Simons Foundation; Moore Foundation; National Fund for Scientific and Technological Development (FONDECYT); National Science Foundation (NSF); UK Research and Innovation Council; USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: NA0003843

OSTI ID:: 1866523

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 513; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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The Origin of Elements from Carbon to Uranium Kobayashi, Chiaki; Karakas, Amanda I.; Lugaro, Maria The Astrophysical Journal, Vol. 900, Issue 2 https://doi.org/10.3847/1538-4357/abae65	journal	September 2020
Star Formation Timescales of the Halo Populations from Asteroseismology and Chemical Abundances* Matsuno, Tadafumi; Aoki, Wako; Casagrande, Luca The Astrophysical Journal, Vol. 912, Issue 1 https://doi.org/10.3847/1538-4357/abeab2	journal	May 2021
Detection of Al ii in the Ultraviolet Spectra of Metal-poor Stars: An Empirical LTE Test of NLTE Aluminum Abundance Calculations* Roederer, Ian U.; Lawler, James E. The Astrophysical Journal, Vol. 912, Issue 2 https://doi.org/10.3847/1538-4357/abf142	journal	May 2021
The 13th Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-IV Survey Mapping Nearby Galaxies at Apache Point Observatory Albareti, Franco D.; Prieto, Carlos Allende; Almeida, Andres The Astrophysical Journal Supplement Series, Vol. 233, Issue 2 https://doi.org/10.3847/1538-4365/aa8992	journal	December 2017
The Second APOKASC Catalog: The Empirical Approach Pinsonneault, Marc H.; Elsworth, Yvonne P.; Tayar, Jamie The Astrophysical Journal Supplement Series, Vol. 239, Issue 2 https://doi.org/10.3847/1538-4365/aaebfd	journal	December 2018
The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra Ahumada, Romina; Prieto, Carlos Allende; Almeida, Andrés The Astrophysical Journal Supplement Series, Vol. 249, Issue 1 https://doi.org/10.3847/1538-4365/ab929e	journal	June 2020
Elevated r-process Enrichment in Gaia Sausage and Sequoia Aguado, David S.; Belokurov, Vasily; Myeong, G. C. The Astrophysical Journal, Vol. 908, Issue 1 https://doi.org/10.3847/2041-8213/abdbb8	journal	February 2021
Evidence from Disrupted Halo Dwarfs that r-process Enrichment via Neutron Star Mergers is Delayed by ≳500 Myr Naidu, Rohan P.; Ji, Alexander P.; Conroy, Charlie The Astrophysical Journal Letters, Vol. 926, Issue 2 https://doi.org/10.3847/2041-8213/ac5589	journal	February 2022

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