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The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars
文献类型：期刊论文
| 作者 | Shi Jianrong2,3 ; Zhang Bo4; Zhao Gang2,3; Cui Wenyuan1,4; Jiang Xiaohua4
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-02-20 |
| 卷号 | 854期号:2 |
| 关键词 | Catalogs Nuclear Reactions Nucleosynthesis Abundances Stars: Abundances Stars: Population Ii |
| DOI | 10.3847/1538-4357/aaa75f |
| 文献子类 | Article |
| 英文摘要 | We determined the fodd, Ba values, 0.46 +/- 0.08, 0.51 +/- 0.09, 0.50 +/- 0.13, and 0.48 +/- 0.12, that correspond to the r-contribution 100% for four r-II stars, CS 29491-069, HE 1219-0312, HE 2327-5642, and HE 2252-4225, respectively. Our results suggest that almost all of the heavy elements (in the range from Ba to Pb) in r-II stars have a common origin, that is, from a single r-process (the main r-process). We found that the fodd, Ba has an intrinsic nature, and should keep a constant value of about 0.46 in the main r-process yields, which is responsible for the heavy element enhancement of r-II stars and of our Galaxy chemical enhancement. In addition, except for the abundance ratio [Ba/Eu] the f(odd,Ba) is also an important indicator, which can be used to study the relative contributions of the r- and s-processes during the chemical evolution history of the Milky Way and the enhancement mechanism in stars with peculiar abundances of heavy elements. |
| WOS关键词 | RELATIVE OSCILLATOR-STRENGTHS ; METAL-POOR STARS ; NEUTRAL HYDROGEN COLLISIONS ; GIANT BRANCH STARS ; FE-I ; HALO STARS ; PRECISION-MEASUREMENT ; MODEL ATMOSPHERES ; CROSS-SECTIONS ; HEAVY-ELEMENTS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000425637200013 |
| 资助机构 | National Natural Science Foundation of China(11643007 ; National Natural Science Foundation of China(11643007 ; 11773009 ; 11773009 ; 11547041 ; 11547041 ; 11673007 ; 11673007 ; 11473033) ; 11473033) ; National Natural Science Foundation of China(11643007 ; National Natural Science Foundation of China(11643007 ; 11773009 ; 11773009 ; 11547041 ; 11547041 ; 11673007 ; 11673007 ; 11473033) ; 11473033) |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/20304]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Shandong Univ Weihai, Sch Space Sci & Phys, Weihai 264209, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Astron, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 4.Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Hebei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi Jianrong,Zhang Bo,Zhao Gang,et al. The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars[J]. ASTROPHYSICAL JOURNAL,2018,854(2). |
| APA | Shi Jianrong,Zhang Bo,Zhao Gang,Cui Wenyuan,&Jiang Xiaohua.(2018).The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars.ASTROPHYSICAL JOURNAL,854(2). |
| MLA | Shi Jianrong,et al."The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars".ASTROPHYSICAL JOURNAL 854.2(2018). |
入库方式： OAI收割
来源：国家天文台
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