Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III
Abstract
We present herein the first detailed elemental abundances in the ultra-faint Magellanic satellite galaxies Carina II (Car II) and Carina III (Car III). With high-resolution Magellan/MIKE spectroscopy, we determined the abundances of nine stars in Car II, including the first abundances of an RR Lyrae star in an ultra-faint dwarf galaxy (UFD), and two stars in Car III. The chemical abundances demonstrate that both systems are clearly galaxies and not globular clusters. The stars in these galaxies mostly display abundance trends matching those of other similarly faint dwarf galaxies: enhanced but declining [α/Fe] ratios, iron-peak elements matching the stellar halo, and unusually low neutron-capture element abundances. One star displays a low outlying [Sc/Fe] = -1.0. We detect a large Ba scatter in Car II, likely due to inhomogeneous enrichment by low-mass asymptotic giant branch star winds. The most striking abundance trend is for [Mg/Ca] in Car II, which decreases from +0.4 to -0.4 and indicates clear variation in the initial progenitor masses of enriching core-collapse supernovae. So far, the only UFDs displaying a similar [Mg/Ca] trend are likely satellites of the Large Magellanic Cloud. We find two stars with [Fe/H] ≤ -3.5 whose abundances likely trace the first generation ofmore »
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF)
- Contributing Org.:
- MagLiteS Collaboration
- OSTI Identifier:
- 1615361
- Report Number(s):
- arXiv:1912.04963; FERMILAB-PUB-19-691-AE
Journal ID: ISSN 1538-4357; oai:inspirehep.net:1791080; TRN: US2106349
- Grant/Contract Number:
- AC02-07CH11359; HST-HF2-51393.001; HST-HF2-51439.001; NAS5-26555; AST-1714873; AST-1813881; AST- 1909584; AST- 1813881
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 889; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Stellar abundances; Dwarf galaxies
Citation Formats
Ji, A. P., Li, T. S., Simon, J. D., Marshall, J., Vivas, A. K., Pace, A. B., Bechtol, K., Drlica-Wagner, A., Koposov, S. E., Hansen, T. T., Allam, S., Gruendl, R. A., Johnson, M. D., McNanna, M., Noël, N. E. D., Tucker, D. L., and Walker, A. R. Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III. United States: N. p., 2020.
Web. doi:10.3847/1538-4357/ab6213.
Ji, A. P., Li, T. S., Simon, J. D., Marshall, J., Vivas, A. K., Pace, A. B., Bechtol, K., Drlica-Wagner, A., Koposov, S. E., Hansen, T. T., Allam, S., Gruendl, R. A., Johnson, M. D., McNanna, M., Noël, N. E. D., Tucker, D. L., & Walker, A. R. Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III. United States. https://doi.org/10.3847/1538-4357/ab6213
Ji, A. P., Li, T. S., Simon, J. D., Marshall, J., Vivas, A. K., Pace, A. B., Bechtol, K., Drlica-Wagner, A., Koposov, S. E., Hansen, T. T., Allam, S., Gruendl, R. A., Johnson, M. D., McNanna, M., Noël, N. E. D., Tucker, D. L., and Walker, A. R. Wed .
"Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III". United States. https://doi.org/10.3847/1538-4357/ab6213. https://www.osti.gov/servlets/purl/1615361.
@article{osti_1615361,
title = {Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III},
author = {Ji, A. P. and Li, T. S. and Simon, J. D. and Marshall, J. and Vivas, A. K. and Pace, A. B. and Bechtol, K. and Drlica-Wagner, A. and Koposov, S. E. and Hansen, T. T. and Allam, S. and Gruendl, R. A. and Johnson, M. D. and McNanna, M. and Noël, N. E. D. and Tucker, D. L. and Walker, A. R.},
abstractNote = {We present herein the first detailed elemental abundances in the ultra-faint Magellanic satellite galaxies Carina II (Car II) and Carina III (Car III). With high-resolution Magellan/MIKE spectroscopy, we determined the abundances of nine stars in Car II, including the first abundances of an RR Lyrae star in an ultra-faint dwarf galaxy (UFD), and two stars in Car III. The chemical abundances demonstrate that both systems are clearly galaxies and not globular clusters. The stars in these galaxies mostly display abundance trends matching those of other similarly faint dwarf galaxies: enhanced but declining [α/Fe] ratios, iron-peak elements matching the stellar halo, and unusually low neutron-capture element abundances. One star displays a low outlying [Sc/Fe] = -1.0. We detect a large Ba scatter in Car II, likely due to inhomogeneous enrichment by low-mass asymptotic giant branch star winds. The most striking abundance trend is for [Mg/Ca] in Car II, which decreases from +0.4 to -0.4 and indicates clear variation in the initial progenitor masses of enriching core-collapse supernovae. So far, the only UFDs displaying a similar [Mg/Ca] trend are likely satellites of the Large Magellanic Cloud. We find two stars with [Fe/H] ≤ -3.5 whose abundances likely trace the first generation of metal-free Population III stars and are well fit by Population III core-collapse supernova yields. An appendix describes our new abundance uncertainty analysis that propagates line-by-line stellar parameter uncertainties.},
doi = {10.3847/1538-4357/ab6213},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 889,
place = {United States},
year = {Wed Jan 22 00:00:00 EST 2020},
month = {Wed Jan 22 00:00:00 EST 2020}
}
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