Lithium in CEMP-no stars: A new constraint on the lithium depletion mechanism in the early universe
文献类型：期刊论文
| 作者 | Matsuno, Tadafumi1,2; Aoki, Wako1,2; Suda, Takuma3; Li, Haining4
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| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
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| 出版日期 | 2017-04-01 |
| 卷号 | 69期号:2 |
| 关键词 | early universe stars: abundances stars: Population II |
| 英文摘要 | Most 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | METAL-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 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000401118500010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8783]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：国家天文台
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