The odd-isotope fractions of Barium in the strongly r-process enhanced (r-II) stars

We determined the \fodd\ values, \(0.46\pm0.08\), \(0.51\pm0.09\), \(0.50\pm0.13\), \(0.48\pm0.12\), which correspond to the r-contribution 100\% for four r-II stars, \cs, \hen, \hes\, and \het, respectively. Our results suggest that almost all of the heavy elements (in the range from Ba to Pb) in r...

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Bibliographic Details
Published inarXiv.org
Main Authors Cui, Wenyuan, Jiang, Xiaohua, Shi, Jianrong, Zhao, Gang, Zhang, Bo
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 24.01.2018
Subjects
Abundance
Barium
Chemical evolution
Heavy elements
Milky Way Galaxy
Organic chemistry
Stars
Stellar evolution
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Summary:We determined the \fodd\ values, \(0.46\pm0.08\), \(0.51\pm0.09\), \(0.50\pm0.13\), \(0.48\pm0.12\), which correspond to the r-contribution 100\% for four r-II stars, \cs, \hen, \hes\, and \het, 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\ has a intrinsic nature, and should keep 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 the abundance ratio [Ba/Eu] the \fodd\ is also an important indicator, which can be used to study the relative contributions of the r- and s-process during the chemical evolution history of the Milky Way and the enhancement mechanism in stars with peculiar abundance of heavy elements.
ISSN:2331-8422