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The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars
Cui Wenyuan1,2; Jiang Xiaohua1; Shi Jianrong3,4; Zhao Gang3,4; Zhang Bo1
2018-02-20
Source PublicationASTROPHYSICAL JOURNAL
Volume854Issue:2
AbstractWe 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.
SubtypeArticle
KeywordCatalogs Nuclear Reactions Nucleosynthesis Abundances Stars: Abundances Stars: Population Ii
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational 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)
DOI10.3847/1538-4357/aaa75f
WOS KeywordRELATIVE OSCILLATOR-STRENGTHS ; METAL-POOR STARS ; NEUTRAL HYDROGEN COLLISIONS ; GIANT BRANCH STARS ; FE-I ; HALO STARS ; PRECISION-MEASUREMENT ; MODEL ATMOSPHERES ; CROSS-SECTIONS ; HEAVY-ELEMENTS
Indexed BySCI
Language英语
Funding OrganizationNational 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)
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425637200013
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20304
Collection光学天文研究部
Affiliation1.Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Hebei, Peoples R China
2.Shandong Univ Weihai, Sch Space Sci & Phys, Weihai 264209, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Key Lab Astron, Beijing 100012, Peoples R China
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Cui Wenyuan,Jiang Xiaohua,Shi Jianrong,et al. The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars[J]. ASTROPHYSICAL JOURNAL,2018,854(2).
APA Cui Wenyuan,Jiang Xiaohua,Shi Jianrong,Zhao Gang,&Zhang Bo.(2018).The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars.ASTROPHYSICAL JOURNAL,854(2).
MLA Cui Wenyuan,et al."The Odd Isotope Fractions of Barium in the Strongly r-process-enhanced (r-II) Stars".ASTROPHYSICAL JOURNAL 854.2(2018).
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