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LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star

文献类型：期刊论文

作者Zhang, Shilin1,2; Li, Haining1; Zhao, Gang1,2; Aoki, Wako3,4; Matsuno, Tadafumi3,4
刊名PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
出版日期2019-10-01
卷号71期号:5页码:7
关键词stars: abundances stars: carbon stars: individual (LAMOST J011939.222-012150.45) stars: Population II
ISSN号0004-6264
DOI10.1093/pasj/psz071
英文摘要We have performed chemical abundance analyses for a newly discovered metal-poor turn-off star (T-eff = 6276K, logg = 3.93, [Fe/H] = -2.93), LAMOST J011939.222-012150.45, based on high-resolution and high signal-to-noise ratio spectra in both optical and near-UV obtained by Subaru. Abundances have been derived for 20 elements, including 11 light elements such as C, N, Na, Mg, etc., and 9 neutron-capture elements from Sr to Pb. This object is a carbon-enhanced metal-poor star with a large carbon excess of [C/Fe] = +2.26. LAMOST J011939.222-012150.45 shows extreme enhancement in s-process elements, especially for Ba, La, and Pb ([Ba/Fe] = +3.16 +/- 0.18, [La/Fe] = +2.29 +/- 0.24, [Pb/Fe] = +3.38 +/- 0.12). A very clear radial velocity variation has also been detected, providing evidence of the existence of a companion. Interestingly, even without any scaling, the observed abundance pattern from light to heavy neutron-capture elements agrees well with predictions of accretion from a companion asymptotic giant branch (AGB) star. Considering the evolutionary status of this object, its surface material is very likely to be completely accreted from its AGB companion and has been preserved until today.
WOS关键词METAL-POOR STARS ; ARCHAEOLOGY SAGA DATABASE ; NEUTRON-CAPTURE ; STELLAR ABUNDANCES ; CARBON-RICH ; ENRICHMENT ; EVOLUTION ; ELEMENTS
资助项目NSFC[11890694] ; NSFC[11573032] ; NSFC[11390371] ; JSPS KAKENHI[16H02168] ; JSPS KAKENHI[16K05287] ; JSPS KAKENHI[15HP7004] ; National Development and Reform Commission ; JSPS-CAS Joint Research Program ; [18J11326]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000491241500011
出版者OXFORD UNIV PRESS
资助机构NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS-CAS Joint Research Program ; JSPS-CAS Joint Research Program ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS-CAS Joint Research Program ; JSPS-CAS Joint Research Program ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS-CAS Joint Research Program ; JSPS-CAS Joint Research Program ; NSFC ; NSFC ; JSPS KAKENHI ; JSPS KAKENHI ; National Development and Reform Commission ; National Development and Reform Commission ; JSPS-CAS Joint Research Program ; JSPS-CAS Joint Research Program
源URL[http://ir.bao.ac.cn/handle/114a11/28033]  
专题中国科学院国家天文台
通讯作者Li, Haining; Zhao, Gang
作者单位1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.SOKENDAI, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
4.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
推荐引用方式
GB/T 7714		 Zhang, Shilin,Li, Haining,Zhao, Gang,et al. LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2019,71(5):7.
APA Zhang, Shilin,Li, Haining,Zhao, Gang,Aoki, Wako,&Matsuno, Tadafumi.(2019).LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,71(5),7.
MLA Zhang, Shilin,et al."LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 71.5(2019):7.

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