Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars
文献类型：期刊论文
| 作者 | Singh,Raghubar3,4; Reddy,Bacham E.3; Campbell,Simon W.5; Kumar,Yerra Bharat2; Vrard,Mathieu1 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 913期号:1 |
| 关键词 | Stellar abundances Asteroseismology Stellar interiors Low mass stars |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/abfa24 |
| 英文摘要 | Abstract We report novel observational evidence on the evolutionary status of lithium-rich giant stars by combining asteroseismic and lithium abundance data. Comparing observations and models of the asteroseismic gravity-mode period spacing ΔΠ1, we find that super-Li-rich giants (SLRs, A(Li)?>?3.2 dex) are almost exclusively young red-clump (RC) stars. Depending on the exact phase of evolution, which requires more data to refine, SLR stars are either (i) less than ～2?Myr or (ii) less than ～40?Myr past the main core helium flash (CHeF). Our observations set a strong upper limit for the time of the inferred Li-enrichment phase of <40 Myr post-CHeF, lending support to the idea that lithium is produced around the time of the CHeF. In contrast, the more evolved RC stars (>40 Myr post-CHeF) generally have low lithium abundances (A(Li)? <1.0 dex). Between the young, super-Li-rich phase, and the mostly old, Li-poor RC phase, there is an average reduction of lithium by about 3 orders of magnitude. This Li destruction may occur rapidly. We find the situation to be less clear with stars having Li abundances between the two extremes of super-Li-rich and Li-poor. This group, the “Li-rich” stars (3.2 > A(Li)?> 1.0 dex), shows a wide range of evolutionary states. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-913-1-ABFA24 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/58809]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Singh,Raghubar |
| 作者单位 | 1.Dept. of Astronomy, The Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA 2.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China 3.Indian Institute of Astrophysics, 560034, 100ft Road Koramangala, Bangalore, India; raghubar2015@gmail.com 4.Pondicherry University R.V. Nagara, Kala Pet, 605014, Puducherry, India 5.School of Physics and Astronomy, Monash University, Clayton, Victoria, Australia |
| 推荐引用方式 GB/T 7714 | Singh,Raghubar,Reddy,Bacham E.,Campbell,Simon W.,et al. Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars[J]. The Astrophysical Journal Letters,2021,913(1). |
| APA | Singh,Raghubar,Reddy,Bacham E.,Campbell,Simon W.,Kumar,Yerra Bharat,&Vrard,Mathieu.(2021).Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars.The Astrophysical Journal Letters,913(1). |
| MLA | Singh,Raghubar,et al."Tracking the Evolution of Lithium in Giants Using Asteroseismology: Super-Li-rich Stars Are Almost Exclusively Young Red-clump Stars".The Astrophysical Journal Letters 913.1(2021). |
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来源：国家天文台
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