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Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo??This work is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.
Li,Haining1; Aoki,Wako2,3; Matsuno,Tadafumi2,3; Kumar,Yerra Bharat1; Shi,Jianrong1; Suda,Takuma4; Zhao,Gang1
2018-01-12
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume852Issue:2
AbstractAbstract 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.
Keywordnuclear reactions, nucleosynthesis, abundances stars: abundances stars: evolution stars: low-mass stars: Population II
DOI10.3847/2041-8213/aaa438
Language英语
WOS IDIOP:2041-8205-852-2-aaa438
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35785
Collection中国科学院国家天文台
Affiliation1.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China
2.National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan; aoki.wako@nao.ac.jp
3.Department of Astronomical Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Mitaka, Tokyo 181-8588, Japan
4.Research Center for the Early Universe, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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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??This work is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.[J]. The Astrophysical Journal Letters,2018,852(2).
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??This work is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan..The Astrophysical Journal Letters,852(2).
MLA Li,Haining,et al."Enormous Li Enhancement Preceding Red Giant Phases in Low-mass Stars in the Milky Way Halo??This work is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.".The Astrophysical Journal Letters 852.2(2018).
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