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Lithium Evolution of Giant Stars Observed by LAMOST and Kepler
Zhang, Jinghua1; Shi, Jian-Rong1,2; Yan, Hong-Liang1,2; Li, Yaguang3,4; Gao, Qi1,2; Li, Chun-Qian1,2; Zhang, Xianfei5; Liu, Shuai1,2; Bi, Shaolan5; Zhao, Gang1,2; Li Y(李焱)2,6,7,8
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2021-09
Volume919Issue:1
DOI10.3847/2041-8213/ac224c
Contribution Rank第6完成单位
Indexed BySCI
Abstract

Mapping lithium evolution for evolved stars will provide restrictions and constraints on the fundamental stellar interior physical processes, which will shed further light on our understanding of the theory of stellar structure and evolution. Based on a sample of 1848 giants with known evolutionary phases and lithium abundances from the LAMOST-Kepler and LAMOST-K2 fields, we construct mass-radius diagrams to characterize the evolutionary features of lithium. The stars at red giant branch (RGB) phase show natural depletion along with their stellar evolution; particularly, there are no obvious crowd stars with anomalously high Li abundances near the bump. Most of the low-mass stars reaching their zero-age sequence of core helium burning (ZAHeB) have Li abundances around similar to 1.0 dex, which shows an increase of Li abundance by similar to 0.6 dex compared to the stars above the RGB bump. This suggests that helium flash may be responsible for moderate Li production, while for super Li-rich stars, some special mechanisms should be considered during helium flash. Other scenarios, such as mergers, could also be sources given that Li-rich stars can be found at any time during the steady-state phase of core He burning. During the core He-burning (HeB) phase, there is no indication of obvious lithium depletion.

Funding ProjectNational Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12090040] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12090044] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12022304] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[U2031203] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11833006] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11973052] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11973042] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11988101] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[11890694] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[U1931102] ; Youth Innovation Promotion Association of the CAS[2019060] ; NAOC Nebula Talents Program ; NASA's Science Mission Directorate ; National Development and Reform Commission
Funding OrganizationNational Key R&D Program of China[2019YFA0405502] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC)[12090040, 12090044, 12022304, U2031203, 11833006, 11973052, 11973042, 11988101, 11890694, U1931102] ; Youth Innovation Promotion Association of the CAS[2019060] ; NAOC Nebula Talents Program ; NASA's Science Mission Directorate ; National Development and Reform Commission
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN2041-8205
URL查看原文
WOS IDWOS:000700888900001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRED ; ABUNDANCE
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24576
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorShi, Jian-Rong
Affiliation1.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China sjr@nao.cas.cn, hlyan@nao.cas.cn;
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100101, People's Republic of China;
3.Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia;
4.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;
5.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China;
6.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China;
7.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People's Republic of China;
8.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing, 100012, People's Republic of China
Recommended Citation
GB/T 7714
Zhang, Jinghua,Shi, Jian-Rong,Yan, Hong-Liang,et al. Lithium Evolution of Giant Stars Observed by LAMOST and Kepler[J]. ASTROPHYSICAL JOURNAL LETTERS,2021,919(1).
APA Zhang, Jinghua.,Shi, Jian-Rong.,Yan, Hong-Liang.,Li, Yaguang.,Gao, Qi.,...&Li Y.(2021).Lithium Evolution of Giant Stars Observed by LAMOST and Kepler.ASTROPHYSICAL JOURNAL LETTERS,919(1).
MLA Zhang, Jinghua,et al."Lithium Evolution of Giant Stars Observed by LAMOST and Kepler".ASTROPHYSICAL JOURNAL LETTERS 919.1(2021).
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