Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy
文献类型:期刊论文
作者 | Yan, Hong-Liang1; Zhou, Yu-Tao1,2,3; Zhang, Xianfei4; Li, Yaguang4,5,6; Gao, Qi1,7; Shi, Jian-Rong1,7; Zhao, Gang1,7; Aoki, Wako8,9; Matsuno, Tadafumi8,9,10; Li Y(李焱)11 |
刊名 | NATURE ASTRONOMY |
出版日期 | 2020-10-05 |
页码 | 10 |
ISSN号 | 2397-3366 |
DOI | 10.1038/s41550-020-01217-8 |
产权排序 | 第11完成单位 |
文献子类 | Article |
英文摘要 | An asteroseismic and spectroscopic analysis of lithium-rich stars improves their classification based on the distributions of lithium, nitrogen and mass, and reveals that most of these evolved stars are red clump rather than red giant branch stars. Lithium has confused scientists for decades at almost every scale of the universe. Lithium-rich giants are peculiar stars with lithium abundances greater than model prediction. A large fraction of lithium-rich low-mass evolved stars are traditionally supposed to be red giant branch (RGB) stars. Recent studies, however, report that red clump (RC) stars are more frequent than RGB stars. Here, we present a uniquely large systematic study that combines direct asteroseismic analysis and spectroscopy of the lithium-rich stars. The majority of lithium-rich stars are confirmed to be RCs, whereas RGBs are a minority. We reveal that the distribution of lithium-rich RGBs declines steeply with increasing lithium abundance, with an upper limit of around 2.6 dex, whereas the lithium abundances of RCs extend to much higher values. We also find that the distributions of mass and nitrogen abundance are notably different between RC and RGB stars. These findings indicate that there is still an unknown process that significantly affects surface chemical composition in low-mass stellar evolution. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星物理学 |
URL标识 | 查看原文 |
出版地 | HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY |
WOS关键词 | KOLMOGOROV-SMIRNOV TEST ; GIANT BRANCH ; STELLAR EVOLUTION ; R STARS ; OSCILLATIONS ; ABUNDANCE ; ATMOSPHERES ; ENRICHMENT ; SIGNATURES ; ORIGIN |
资助项目 | National Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11833006] ; National Natural Science Foundation of China[11833002] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11973052] ; National Natural Science Foundation of China[11973042] ; National Natural Science Foundation of China[11603037] ; National Natural Science Foundation of China[11973049] ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[XDB34020205] ; International Partnership Program of the CAS[114A32KYSB20160049] ; Youth Innovation Promotion Association of the CAS[2019060] ; Japan Society for the Promotion of Science (JSPS)[18J11326] ; Mt. Cuba Astronomical Foundation ; JSPS-CAS joint research programme ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories of the CAS ; Alibaba Cloud ; National Development and Reform Commission |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | NATURE RESEARCH |
WOS记录号 | WOS:000575344500001 |
资助机构 | National Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of China[11988101, 11833006, 11833002, 11890694, 11973052, 11973042, 11603037, 11973049] ; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[XDB34020205] ; International Partnership Program of the CAS[114A32KYSB20160049] ; Youth Innovation Promotion Association of the CAS[2019060] ; Japan Society for the Promotion of Science (JSPS)[18J11326] ; Mt. Cuba Astronomical Foundation ; JSPS-CAS joint research programme ; Cultivation Project for LAMOST Scientific Payoff and Research Achievement of CAMS-CAS ; Astronomical Big Data Joint Research Center ; National Astronomical Observatories of the CAS ; Alibaba Cloud ; National Development and Reform Commission |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23784] |
专题 | 云南天文台_恒星物理研究组 |
通讯作者 | Shi, Jian-Rong; Zhao, Gang |
作者单位 | 1.Key Laboratory of Optical Astronomy, National Astronomical Observatories of China, Chinese Academy of Sciences, Beijing, China 2.Department of Astronomy, School of Physics, Peking University, Beijing, China 3.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, China 4.Department of Astronomy, Beijing Normal University, Beijing, China 5.Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, Sydney, NSW, Australia 6.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Aarhus Centrum, Denmark 7.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, China 8.National Astronomical Observatory of Japan, Tokyo, Japan 9.Department of Astronomical Science, School of Physical Sciences, The Graduate University for Advanced Studies (SOKENDAI), Tokyo, Japan 10.Kapteyn Astronomical Institute, University of Groningen, Groningen, The Netherlands |
推荐引用方式 GB/T 7714 | Yan, Hong-Liang,Zhou, Yu-Tao,Zhang, Xianfei,et al. Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy[J]. NATURE ASTRONOMY,2020:10. |
APA | Yan, Hong-Liang.,Zhou, Yu-Tao.,Zhang, Xianfei.,Li, Yaguang.,Gao, Qi.,...&Liang, Xi-Long.(2020).Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy.NATURE ASTRONOMY,10. |
MLA | Yan, Hong-Liang,et al."Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy".NATURE ASTRONOMY (2020):10. |
入库方式: OAI收割
来源:云南天文台
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