High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST

doi:10.3847/1538-4357/ab1b4b

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	High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST
	Zhou,Yutao 1,2; Yan,Hongliang 1,2; Shi,Jianrong 1,2; Blanco-Cuaresma,S.3; Gao,Qi 1,2; Pan,K.4; Xu,Xiaodong 1,2; Zhang,Junbo 1; Zhao,Gang 1,2
刊名	The Astrophysical Journal
	2019-05-31
卷号	877 期号:2
关键词	stars: abundances stars: chemically peculiar stars: evolution stars: late-type
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1b4b
英文摘要	Abstract The discovery of Li-rich giants has introduced a new challenge for standard stellar evolution models. To resolve this issue, the number of this type of object has been rapidly increased through the development of worldwide surveys. Taking advantage of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope survey, 44 new Li-rich giants are reported, which are confirmed with high-resolution observations. Based on the high-resolution and high signal-to-noise spectra, we derived the atmospheric parameters and elemental abundances with the spectral synthesis method. We performed a detailed analysis of their evolutionary stages, infrared excess, projected rotational velocity ( ), and stellar population. We find that (1) the Li-rich giants concentrate at the evolutionary status of the red giant branch bump, red clump, and asymptotic giant branch; (2) three of them are fast rotators and none exhibit infrared excess. Our results imply that the origins of Li enrichment are most likely to be associated with the extra mixing in the stellar interior, and the external sources might only make a minor contribution. Moreover, various Li-rich episodes take place at different evolutionary stages.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-877-2-AB1B4B
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26421]
专题	中国科学院国家天文台
作者单位	1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China zhouyutao@nao.cas.cn, sjr@nao.cas.cn 2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3.Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA 4.Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM, 88349-0059, USA
推荐引用方式 GB/T 7714	Zhou,Yutao,Yan,Hongliang,Shi,Jianrong,et al. High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST[J]. The Astrophysical Journal,2019,877(2).
APA	Zhou,Yutao.,Yan,Hongliang.,Shi,Jianrong.,Blanco-Cuaresma,S..,Gao,Qi.,...&Zhao,Gang.(2019).High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST.The Astrophysical Journal,877(2).
MLA	Zhou,Yutao,et al."High-resolution Spectroscopic Analysis of a Large Sample of Li-rich Giants Found By LAMOST".The Astrophysical Journal 877.2(2019).