NAOC Open IR
LAMOST J011939.222-012150.45: The most barium-enhanced CEMP-s turnoff star
Zhang, Shilin1,2; Li, Haining1; Zhao, Gang1,2; Aoki, Wako3,4; Matsuno, Tadafumi3,4
2019-10-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN0004-6264
Volume71Issue:5Pages:7
AbstractWe 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.
Keywordstars: abundances stars: carbon stars: individual (LAMOST J011939.222-012150.45) stars: Population II
Funding OrganizationNSFC ; 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
DOI10.1093/pasj/psz071
WOS KeywordMETAL-POOR STARS ; ARCHAEOLOGY SAGA DATABASE ; NEUTRON-CAPTURE ; STELLAR ABUNDANCES ; CARBON-RICH ; ENRICHMENT ; EVOLUTION ; ELEMENTS
Language英语
Funding ProjectNSFC[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]
Funding OrganizationNSFC ; 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
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000491241500011
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28034
Collection中国科学院国家天文台
Corresponding AuthorLi, Haining; Zhao, Gang
Affiliation1.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
Recommended Citation
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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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