Chemical Tagging N-rich Field Stars with High-resolution Spectroscopy
文献类型：期刊论文
| 作者 | Yu,Jincheng2; Tang,Baitian2; Fernández-Trincado,José G.3,4; Geisler,Douglas1,5,6; Yan,Hongliang7 ; Soto,M.3
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2021-05-01 |
| 卷号 | 913期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Stellar evolution Stellar abundances Chemically peculiar stars |
| DOI | 10.3847/1538-4357/abf64d |
| 英文摘要 | Abstract We measure chemical abundances for over 20 elements of 15 N-rich field stars with high-resolution (R ～ 30,000) optical spectra. We find that Na, Mg, Al, Si, and Ca abundances of our N-rich field stars are mostly consistent with those of stars from globular clusters (GCs). Seven stars are estimated to have [Al/Fe ] > 0.5, which is not found in most GC “first generation” stars. On the other hand, α element abundances (especially Ti) could show distinguishable differences between in situ stars and accreted stars. We discover that one interesting star, with consistently low [Mg/Fe], [Si/Fe], [Ca/Fe], [Ti/Fe], [Sc/Fe], [V/Fe], and [Co/Fe], show similar kinematics and [Ba/Eu] as other stars from the dissolved dwarf galaxy “Gaia–Sausage–Enceladus.” The α-element abundances and the iron-peak element abundances of the N-rich field stars with metallicities ? 1.25 ≤ [Fe/H] ≤ ? 0.95 show consistent values with Milky Way field stars (we refer to Milky Way field stars as Milky Way halo field stars unless otherwise specified in this paper) rather than stars from dwarf galaxies, indicating that they were formed in situ. In addition, the neutron-capture elements of N-rich field stars show that most of them could be enriched by asymptotic giant branch stars with masses around 3–5 M⊙. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-913-1-ABF64D |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58452]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Tang,Baitian |
| 作者单位 | 1.Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Concepción, Chile 2.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People’s Republic of China; tangbt@mail.sysu.edu.cn 3.Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama, Copayapu 485, Copiapó, Chile 4.Centro de Investigación en Astronomía, Universidad Bernardo O Higgins, Avenida Viel 1497, Santiago, Chile 5.Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena. Avenida Raúl Bitrán S/N, La Serena, Chile 6.Departamento de Astronomía, Facultad de Ciencias, Universidad de La Serena. Av., Chile 7.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Yu,Jincheng,Tang,Baitian,Fernández-Trincado,José G.,et al. Chemical Tagging N-rich Field Stars with High-resolution Spectroscopy[J]. The Astrophysical Journal,2021,913(1). |
| APA | Yu,Jincheng,Tang,Baitian,Fernández-Trincado,José G.,Geisler,Douglas,Yan,Hongliang,&Soto,M..(2021).Chemical Tagging N-rich Field Stars with High-resolution Spectroscopy.The Astrophysical Journal,913(1). |
| MLA | Yu,Jincheng,et al."Chemical Tagging N-rich Field Stars with High-resolution Spectroscopy".The Astrophysical Journal 913.1(2021). |
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来源：国家天文台
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