期刊
ASTROPHYSICAL JOURNAL
卷 854, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aaa75f
关键词
catalogs; nuclear reactions; nucleosynthesis; abundances; stars: abundances; stars: Population II
资金
- National Natural Science Foundation of China [11643007, 11773009, 11547041, 11673007, 11473033]
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.
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