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

doi:10.1093/pasj/psz071

CORC > 国家天文台 > 中国科学院国家天文台

	LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star
	Zhang, Shilin 1,2; Li, Haining 1; Zhao, Gang 1,2; Aoki, Wako 3,4; Matsuno, Tadafumi 3,4
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	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
DOI	10.1093/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.
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关键词	METAL-POOR STARS ; ARCHAEOLOGY SAGA DATABASE ; NEUTRON-CAPTURE ; STELLAR ABUNDANCES ; CARBON-RICH ; ENRICHMENT ; EVOLUTION ; ELEMENTS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000491241500011
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
内容类型	期刊论文
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.