Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo

doi:10.3847/2041-8213/aaa438

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	Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo
	Li, Haining 4; Aoki, Wako 1,2; Matsuno, Tadafumi 1,2; Kumar, Yerra Bharat 4; Shi, Jianrong 4; Suda, Takuma 3; Zhao, Gang 4
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2018-01-10
卷号	852 期号:2 页码:6
关键词	nuclear reactions, nucleosynthesis, abundances stars: abundances stars: evolution stars: low-mass stars: Population II
ISSN号	2041-8205
DOI	10.3847/2041-8213/aaa438
英文摘要	Li abundances in the bulk of low-mass metal-poor stars are well reproduced by stellar evolution models adopting a constant initial abundance. However, a small number of stars have exceptionally high Li abundances, for which no convincing models have been established. We report on the discovery of 12 very metal-poor stars that have large excesses of Li, including an object having more than 100 times higher Li abundance than the values found in usual objects, which is the largest excess in metal-poor stars known to date. The sample is distributed over a wide range of evolutionary stages, including five unevolved stars, showing no clear abundance anomaly in other elements. The results indicate the existence of an efficient process to enrich Li in a small fraction of low-mass stars at the main-sequence or subgiant phase. The wide distribution of Li-rich stars along the red giant branch could be explained by the dilution of surface Li by mixing that occurs when the stars evolve into red giants. Our study narrows down the problem to be solved in order to understand the origins of Li excess found in low-mass stars, suggesting the presence of an unknown process that affects the surface abundances preceding red giant phases.
资助项目	Chinese NDRC ; NSFC[11573032] ; NSFC[11233004] ; NSFC[11390371] ; NSFC[11473033] ; NSFC[11550110492] ; JSPS KAKENHI[16H02168] ; JSPS KAKENHI[16K05287] ; JSPS KAKENHI[15HP7004] ; JSPS-CAS
WOS关键词	METAL-POOR STARS ; LITHIUM PRODUCTION ; RICH ; TELESCOPE ; ABUNDANCES ; ACCRETION ; LAMOST ; DWARFS ; BRANCH ; SCALE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000422737500001
资助机构	Chinese NDRC ; Chinese NDRC ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; JSPS-CAS ; JSPS-CAS ; Chinese NDRC ; Chinese NDRC ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; JSPS-CAS ; JSPS-CAS ; Chinese NDRC ; Chinese NDRC ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; JSPS-CAS ; JSPS-CAS ; Chinese NDRC ; Chinese NDRC ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; JSPS-CAS ; JSPS-CAS
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37365]
专题	中国科学院国家天文台
通讯作者	Aoki, Wako
作者单位	1.Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan 2.SOKENDAI, Sch Phys Sci, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan 3.Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan 4.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Li, Haining,Aoki, Wako,Matsuno, Tadafumi,et al. Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,852(2):6.
APA	Li, Haining.,Aoki, Wako.,Matsuno, Tadafumi.,Kumar, Yerra Bharat.,Shi, Jianrong.,...&Zhao, Gang.(2018).Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo.ASTROPHYSICAL JOURNAL LETTERS,852(2),6.
MLA	Li, Haining,et al."Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo".ASTROPHYSICAL JOURNAL LETTERS 852.2(2018):6.