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Investigation of the puzzling abundance pattern of the neutron-capture elements in the ultra-metal-poor star CS 30322-023
Cui, Wen-Yuan; Zhang, Bo; Ma, Kun; Zhang, Lu
2007-03-10
发表期刊ASTROPHYSICAL JOURNAL
卷号657期号:2页码:1037-1041
摘要The s-enhanced and very metal-poor star CS 30322-023 shows a puzzling abundance pattern of the neutron-capture elements. In particular, several neutron-capture elements, such as Ba and Pb, show enhancement, but other neutron-capture elements, such as Sr and Eu, exhibit deficiencies with respect to iron. The study of this sample star could provide a better understanding of s- and r-process nucleosynthesis at low metallicity. Using a parametric model, we find that the abundance pattern of neutron-capture elements could be best explained by a star that was polluted by an asymptotic giant branch (AGB) star, and if the CS 30322-023 binary system formed in a molecular cloud that had never been polluted by r-process material. The lack of r-process material also indicates that the AGB companion cannot have undergone a Type 1.5 supernova, and thus must have had an initial mass below 4.0 M., while the strong N overabundance and the absence of a strong C overabundance indicate that the companion's initial mass was larger than 2.0 M.. The smaller s-process-component coefficient of this star illustrates that there is less material accreted onto this star from the AGB companion and that the sample star should have formed in a binary system with a larger initial orbital separation, where the accretion-induced collapse (AIC) mechanism cannot work.
关键词Stars : Agb And post-Agb Nuclear Reactions Nucleosynthesis Abundances
收录类别SCI
语种英语
WOS记录号WOS:000244928500029
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7886
专题光学天文研究部
作者单位1.Hebei Normal Univ, Dept Phys, Shijiazhuang, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China
4.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
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Cui, Wen-Yuan,Zhang, Bo,Ma, Kun,et al. Investigation of the puzzling abundance pattern of the neutron-capture elements in the ultra-metal-poor star CS 30322-023[J]. ASTROPHYSICAL JOURNAL,2007,657(2):1037-1041.
APA Cui, Wen-Yuan,Zhang, Bo,Ma, Kun,&Zhang, Lu.(2007).Investigation of the puzzling abundance pattern of the neutron-capture elements in the ultra-metal-poor star CS 30322-023.ASTROPHYSICAL JOURNAL,657(2),1037-1041.
MLA Cui, Wen-Yuan,et al."Investigation of the puzzling abundance pattern of the neutron-capture elements in the ultra-metal-poor star CS 30322-023".ASTROPHYSICAL JOURNAL 657.2(2007):1037-1041.
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