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Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase
Singh,Raghubar1,2; Reddy,Bacham E.1; Bharat Kumar,Yerra3; Antia,H. M.4
2019-06-11
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume878Issue:1
AbstractAbstract In this Letter, we report the discovery of 24 new super Li-rich (A(Li)?≥?3.2) giants of He-core burning phase at the red clump region. Results are based on a systematic search of a large sample of about 12,500 giants common to the LAMOST spectroscopic and Kepler time-resolved photometric surveys. The two key parameters derived from Kepler data are an average period spacing (Δp) between l?=?1 mixed gravity-dominated g-modes and average large frequency-separation (Δν) l?=?0 acoustic p-modes, which suggest all the Li-rich giants are in the He-core burning phase. This is the first unbiased survey subjected to a robust technique of asteroseismic analysis to unambiguously determine the evolutionary phase of Li-rich giants. The results provide strong evidence that the Li enhancement phenomenon is associated with giants in the He-core burning phase post He-flash, rather than any other phase on the red giant branch with an inert He-core surrounded by a H-burning shell.
Keywordasteroseismology stars: abundances stars: evolution stars: late-type stars: low-mass
DOI10.3847/2041-8213/ab2599
Language英语
WOS IDIOP:2041-8205-878-1-ab2599
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28922
Collection中国科学院国家天文台
Affiliation1.Indian Institute of Astrophysics 560034, 100ft road Koramangala, Bangalore, India; raghubar2015@gmail.com, raghubar.singh@iiap.res.in
2.Pondicherry University R. V. Nagara, Kala Pet, 605014, Puducherry, India
3.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China
4.Tata Institute of Fundamental Research Mumbai, India
Recommended Citation
GB/T 7714
Singh,Raghubar,Reddy,Bacham E.,Bharat Kumar,Yerra,等. Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase[J]. The Astrophysical Journal Letters,2019,878(1).
APA Singh,Raghubar,Reddy,Bacham E.,Bharat Kumar,Yerra,&Antia,H. M..(2019).Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase.The Astrophysical Journal Letters,878(1).
MLA Singh,Raghubar,et al."Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase".The Astrophysical Journal Letters 878.1(2019).
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