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Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe
Matsuno, Tadafumi1,2; Aoki, Wako1,2; Suda, Takuma3; Li, Haining4
2017-04-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume69Issue:2
AbstractMost relatively warm, unevolved, metal-poor stars (T-eff greater than or similar to 5800 K and [Fe/H] less than or similar to -1.5) exhibit almost constant lithium abundances, irrespective of metallicity or effective temperature, and thus form the so-called Spite plateau. This was originally interpreted as arising from lithium created by the Big Bang nucleosynthesis. Recent observations, however, have revealed that ultra metal-poor stars (UMP stars; [Fe/H] < -4.0) have significantly lower lithium abundances than those of the plateau. Since most of the UMP stars are carbon-enhanced metal-poor stars with no excess of neutron-capture elements (CEMP-no stars), a connection between the carbon enhancement and lithium depletion is suspected. A straightforward approach to this question is to investigate carbon-normal UMP stars. However, only one object is known in this class. As an alternative, we have determined lithium abundances for two CEMP-no main-sequence turn-off stars with metallicities [Fe/H] similar to -3.0, where there are numerous carbon-normal stars with available lithium abundances that can be considered. Our 1D local thermodynamic equilibrium analysis indicates that the two CEMP-no stars have lithium abundances that are consistent with values near the plateau, which suggests that carbon enhancement and lithium depletion are not directly related. Instead, our results suggest that extremely low iron abundance is a fundamental cause of depleted lithium in UMP stars.
SubtypeArticle
KeywordEarly Universe Stars: Abundances Stars: Population Ii
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationJSPS KAKENHI(JP23224004 ; JSPS KAKENHI(JP23224004 ; NSFC(11573032 ; NSFC(11573032 ; JP16H02168) ; JP16H02168) ; 11233004 ; 11233004 ; 11390371) ; 11390371) ; JSPS KAKENHI(JP23224004 ; JSPS KAKENHI(JP23224004 ; NSFC(11573032 ; NSFC(11573032 ; JP16H02168) ; JP16H02168) ; 11233004 ; 11233004 ; 11390371) ; 11390371)
DOI10.1093/pasj/psw129
WOS KeywordMETAL-POOR STARS ; ARCHAEOLOGY SAGA DATABASE ; BIG-BANG NUCLEOSYNTHESIS ; DIGITAL SKY SURVEY ; LESS-THAN -5.0 ; HALO-STARS ; 1ST STARS ; SPITE PLATEAU ; DATA RELEASE ; MILKY-WAY
Indexed BySCI
Language英语
Funding OrganizationJSPS KAKENHI(JP23224004 ; JSPS KAKENHI(JP23224004 ; NSFC(11573032 ; NSFC(11573032 ; JP16H02168) ; JP16H02168) ; 11233004 ; 11233004 ; 11390371) ; 11390371) ; JSPS KAKENHI(JP23224004 ; JSPS KAKENHI(JP23224004 ; NSFC(11573032 ; NSFC(11573032 ; JP16H02168) ; JP16H02168) ; 11233004 ; 11233004 ; 11390371) ; 11390371)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000401118500010
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8783
Collection光学天文研究部
Affiliation1.SOKENDAI, Sch Phys Sci, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
2.NAOJ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
3.Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
4.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, A20 Datun Rd, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Matsuno, Tadafumi,Aoki, Wako,Suda, Takuma,et al. Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2017,69(2).
APA Matsuno, Tadafumi,Aoki, Wako,Suda, Takuma,&Li, Haining.(2017).Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,69(2).
MLA Matsuno, Tadafumi,et al."Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69.2(2017).
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