Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant

doi:10.1093/mnras/stz3222

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	Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant
	Singh, Raghubar 1,2; Kumar, Yerra Bharat 3; Reddy, Bacham E.1,3; Aoki, Wako 4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2020
卷号	491 期号:3 页码:3838-3843
关键词	stars: abundances stars: evolution stars: fundamental parameters stars: low-mass
ISSN号	0035-8711
DOI	10.1093/mnras/stz3222
英文摘要	Given the implications for the origin of Li enhancement in red giants, we have reviewed the Li-rich classification of KIC 9821622, the only bonafide red giant branch (RGB) giant with a He inert core to date, reported as a Li-rich giant by reanalysing the high-resolution spectra. We have obtained A(Li)(LTE) = 1.42 +/- 0.05 dex. After correcting for non-local thermodynamic equilibrium (NLTE), we have A(Li)(NLTE) = 1.57 +/- 0.05 dex, which is significantly less than the reported A(Li) = 1.80 +/- 0.2 dex. We found that the subordinate line at 6103 A is too weak or absent to measure Li abundance. The derived abundance is normal for red giants undergoing dilution during the first dredge-up. Since all known Kepler field Li-rich giants belong to the red clump region, this clarification removes the anomaly and strengthens the evidence that Li enhancement in low-mass giants may be associated only with the He-core burning phase. The origin of Li excess probably lies during the He flash at the RGB tip, a phase immediately preceding the red clump.
资助项目	NAOC, Beijing through the CAS PIFI grant ; LAMOST Fellowship ; NSFC[11850410437]
WOS关键词	STELLAR EVOLUTION ; LITHIUM ENRICHMENT ; MAIN-SEQUENCE ; K-GIANT ; CALIBRATION ; ISOCHRONES ; SEARCH ; BRANCH ; TRACKS ; MO
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000512306500051
资助机构	NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; LAMOST Fellowship ; LAMOST Fellowship ; NSFC ; NSFC ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; LAMOST Fellowship ; LAMOST Fellowship ; NSFC ; NSFC ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; LAMOST Fellowship ; LAMOST Fellowship ; NSFC ; NSFC ; NAOC, Beijing through the CAS PIFI grant ; NAOC, Beijing through the CAS PIFI grant ; LAMOST Fellowship ; LAMOST Fellowship ; NSFC ; NSFC
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/54256]
专题	中国科学院国家天文台
通讯作者	Singh, Raghubar
作者单位	1.Indian Inst Astrophys, 2 Block, Koramangala 560034, Bengaluru, India 2.Pondicherry Univ RV Nagara, Kala Pet 605014, Puducherry, India 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100101, Peoples R China 4.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
推荐引用方式 GB/T 7714	Singh, Raghubar,Kumar, Yerra Bharat,Reddy, Bacham E.,et al. Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,491(3):3838-3843.
APA	Singh, Raghubar,Kumar, Yerra Bharat,Reddy, Bacham E.,&Aoki, Wako.(2020).Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,491(3),3838-3843.
MLA	Singh, Raghubar,et al."Concerning the Li-rich status of KIC 9821622: a Kepler field RGB star reported as a Li-rich giant".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 491.3(2020):3838-3843.