Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase

doi:10.3847/2041-8213/ab2599

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	Survey of Li-rich Giants among Kepler and LAMOST Fields: Determination of Li-rich Giants’ Evolutionary Phase
	Singh,Raghubar 3,4; Reddy,Bacham E.4; Bharat Kumar,Yerra 2; Antia,H. M.1
刊名	The Astrophysical Journal Letters
	2019-06-11
卷号	878 期号:1
关键词	asteroseismology stars: abundances stars: evolution stars: late-type stars: low-mass
ISSN号	2041-8205
DOI	10.3847/2041-8213/ab2599
英文摘要	Abstract 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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:2041-8205-878-1-AB2599
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/28921]
专题	中国科学院国家天文台
作者单位	1.Tata Institute of Fundamental Research Mumbai, India 2.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China 3.Pondicherry University R. V. Nagara, Kala Pet, 605014, Puducherry, India 4.Indian Institute of Astrophysics 560034, 100ft road Koramangala, Bangalore, India; raghubar2015@gmail.com, raghubar.singh@iiap.res.in
推荐引用方式 GB/T 7714	Singh,Raghubar,Reddy,Bacham E.,Bharat Kumar,Yerra,et al. 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).