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The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars*?Based on observations carried out at the European Southern Observatory, Paranal, Chile (Proposal number 170.D-0010 and 280.D-5011).
Wenyuan,Cui1,2; Xiaohua,Jiang1; Jianrong,Shi3,4; Gang,Zhao3,4; Bo,Zhang1
2018-02-20
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume854Issue:2
AbstractAbstract 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 fodd,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.
Keywordcatalogs nuclear reactions, nucleosynthesis, abundances stars: abundances stars: Population II
DOI10.3847/1538-4357/aaa75f
Language英语
WOS IDIOP:0004-637X-854-2-aaa75f
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/35715
Collection中国科学院国家天文台
Affiliation1.Department of Physics, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China; wenyuancui@126.com, cuiwenyuan@hebtu.edu.cn
2.School of Space Science and Physics, Shandong University at Weihai, Weihai 264209, People’s Republic of China
3.Key Lab of Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Recommended Citation
GB/T 7714
Wenyuan,Cui,Xiaohua,Jiang,Jianrong,Shi,et al. The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars*?Based on observations carried out at the European Southern Observatory, Paranal, Chile (Proposal number 170.D-0010 and 280.D-5011).[J]. The Astrophysical Journal,2018,854(2).
APA Wenyuan,Cui,Xiaohua,Jiang,Jianrong,Shi,Gang,Zhao,&Bo,Zhang.(2018).The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars*?Based on observations carried out at the European Southern Observatory, Paranal, Chile (Proposal number 170.D-0010 and 280.D-5011)..The Astrophysical Journal,854(2).
MLA Wenyuan,Cui,et al."The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars*?Based on observations carried out at the European Southern Observatory, Paranal, Chile (Proposal number 170.D-0010 and 280.D-5011).".The Astrophysical Journal 854.2(2018).
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