The Southern Stellar Stream Spectroscopic Survey (S 5): Chemical Abundances of Seven Stellar Streams,The Astronomical Journal

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The Southern Stellar Stream Spectroscopic Survey (S 5): Chemical Abundances of Seven Stellar Streams
The Astronomical Journal ( IF 5.3 ) Pub Date : 2020-09-24 , DOI: 10.3847/1538-3881/abacb6
Alexander P. Ji ₁ , Ting S. Li _{1,

2} , Terese T. Hansen _{3,

4} , Andrew R. Casey ₅ , Sergey E. Koposov _{6,

7,

8,

9} , Andrew B. Pace ₆ , Dougal Mackey ₁₀ , Geraint F. Lewis ₁₁ , Jeffrey D. Simpson _{12,

13} , Joss Bland-Hawthorn _{11,

13} , Lara R. Cullinane ₁₀ , Gary. S. Da Costa ₁₀ , Kohei Hattori ₆ , Sarah L. Martell _{12,

13} , Kyler Kuehn _{14,

15} , Denis Erkal ₁₆ , Nora Shipp _{17,

18,

19} , Zhen Wan ₁₁ , Daniel B. Zucker _{20,

21}

Affiliation

Observatories of the Carnegie Institution for Science, 813 Santa Barbara St., Pasadena, CA 91101, USA
Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
Department of Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA
School of Physics and Astronomy, Monash University, Wellington Rd., Clayton, VIC 3800, Australia
McWilliams Center for Cosmology, Carnegie Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213, USA
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
Institute of Astronomy, University of Cambridge, Madingley Rd., Cambridge CB3 0HA, UK
Kavli Institute for Cosmology, University of Cambridge, Madingley Rd., Cambridge CB3 0HA, UK
Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia
School of Physics, UNSW, Sydney, NSW 2052, Australia
Centre of Excellence for All-Sky Astrophysics in Three Dimensions (ASTRO 3D), Australia
Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia
Department of Physics, University of Surrey, Guildford GU2 7XH, UK
Department of Astronomy & Astrophysics, University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637, USA
Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA
Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA
Department of Physics & Astronomy, Macquarie University, Sydney, NSW 2109, Australia
Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics, Sydney, NSW 2109, Australia

We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.

中文翻译：

南方恒星流光谱调查（S 5）：七颗恒星流的化学丰度

我们展示了由南方恒星流光谱调查 (S5) 确认的 7 个恒星流中 42 颗红巨星的高分辨率麦哲伦/MIKE 光谱：ATLAS、Aliqa Uma、Chenab、Elqui、Indus、Jhelum 和 Phoenix。使用光度恒星参数和标准 LTE 分析，从 10,000 多个单独的线测量或上限得出了 30 种元素的丰度。这是目前恒星流中最广泛的恒星元素丰度集。三个流（ATLAS、Aliqa Uma 和 Phoenix）是被破坏的贫金属球状星团，尽管在球状星团中常见的轻元素反相关性只有微弱的证据。四个溪流（Chenab、Elqui、Indus 和 Jhelum）是被扰乱的矮星系，并且它们的恒星显示出丰度特征，表明恒星质量范围为 $10^6-10^7 M_\odot$ 的祖先。对分析方法提供了广泛的描述，包括推导了一种新方法，该方法包括恒星参数相关性对每颗恒星的丰度和不确定性的影响。本文包括使用位于智利拉斯坎帕纳斯天文台的 6.5 米麦哲伦望远镜收集的数据。

更新日期：2020-09-24

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