The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars
The study of s-process nucleosynthesis based on barium stars, CEMP-s and CEMP-r/s stars
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基于钡星、CEMP-s和CEMP-r/s星的s过程核合成研究
DOI:
10.1007/s10509-013-1450-1
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发表时间:
2013-04
影响因子:
1.9
通讯作者:
Zhang Bo
中科院分区:
文献类型:
--
作者:
Zhang Caixia;Meng Xiaoying;Shao Lang;Zhang Bo
In order to get a broader view of the s-process nucleosynthesis we study the abundance distribution of heavy elements of 35 barium stars and 24 CEMP-stars, including nine CEMP-s stars and 15 CEMP-r/s stars. The similar distribution of [Pb/hs] between CEMP-s and CEMP-r/s stars indicate that the s-process material of both CEMP-s and CEMP-r/s stars should have a uniform origin, i.e. mass transfer from their predominant AGB companions. For the CEMP-r/s stars, we found that the r-process should provide similar proportional contributes to the second s-peak and the third s-peak elements, and also be responsible for the higher overabundance of heavy elements than those in CEMP-s stars. Which hints that the r-process origin of CEMP-r/s stars should be closely linked to the main r-process. The fact that some smallrvalues exist for both barium and CEMP-s stars, implies that the single exposure event of the s-process nucleosynthesis should be general in a wide metallicity range of our Galaxy. Based on the relation betweenCrandCs, we suggest that the origin of r-elements for CEMP-r/s stars have more sources. A common scenario is that the formation of the binary system was triggered by only one or a few supernova. In addition, accretion-induced collapse(AIC) or SN 1.5 should be the supplementary scenario, especially for these whose pre-AGB companion with higher mass and smaller orbit radius, which support the higher values of bothCrandCs.
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DOI:
--
发表时间:
2011-09
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
作者:
A. McWilliam
通讯作者:
A. McWilliam
影响因子:
6.5
作者:
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DOI:
10.1111/j.1365-2966.2006.10877.x
发表时间:
2006-08
影响因子:
4.8
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DOI:
10.1086/511969
发表时间:
2006-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
K. Cleary;C. Lawrence;J. Marshall;L. Hao;D. M. J. P. Laboratory;C. I. O. Technology.;C. University-C.-Univers
通讯作者:
K. Cleary;C. Lawrence;J. Marshall;L. Hao;D. M. J. P. Laboratory;C. I. O. Technology.;C. University-C.-Univers
DOI:
10.1086/161109
发表时间:
1983-07
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. F. Dominy;D. Lambert
通讯作者:
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