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).

doi:10.3847/1538-4357/aaa75f

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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,Cui 1,2; Xiaohua,Jiang 1; Jianrong,Shi 3,4; Gang,Zhao 3,4; Bo,Zhang 1
刊名	The Astrophysical Journal
	2018-02-20
卷号	854 期号:2
关键词	catalogs nuclear reactions, nucleosynthesis, abundances stars: abundances stars: Population II
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa75f
英文摘要	Abstract 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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-854-2-AAA75F
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/35714]
专题	中国科学院国家天文台
作者单位	1.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
推荐引用方式 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).