Puzzling Origin of CEMP-r/s Stars: An Interpretation of Abundance and Enrichment of s- and r-Process Elements from Asymptotic Giant Branch Supernovae
Zhang, Jiang1,2; Zhao, Fang3; Chen, Yanping3; Cui, Wenyuan3; Zhang, Bo3; Zhang, B (reprint author), Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China.
发表期刊JOURNAL OF ASTROPHYSICS AND ASTRONOMY
2013-12
卷号34期号:4页码:373-391
DOI10.1007/s12036-013-9191-7
收录类别SCI
关键词Nuclear Reactions: Nucleosynthesis: Abundances Stars: Agb And post-Agb
摘要CEMP-r/s stars at low metallicity are known as double-enhanced stars that show enhancements of both r-process and s-process elements. The chemical abundances of these very metal-poor stars provide us a lot of information for putting new restraints on models of neutron-capture processes. In this article, we put forward an accreted scenario in which the double enrichment of r-process and s-process elements is caused by a former intermediate-mass Asymptotic Giant Branch (AGB) companion in a detached binary system. As the AGB superwind is only present at the ultimate phase of AGB stars, there is thus a lot of potential that the degenerate-core mass of an intermediate-mass AGB star reaches the Chandrasekhar limit before the AGB superwind. In these circumstances, both s-process elements produced in the AGB shell and r-process elements synthesized in the subsequent explosion would be sprayed contemporaneously and accreted by its companion. Despite similarity to physical conditions of a core-collapse supernova, a major focus in this scenario is the degenerate C-O core surrounded by an envelope of a former intermediate-mass AGB donor that may collapse and explode. Due to the existence of an outer envelope, r-process nucleosynthesis is expected to occur. Hypothesizing the material-rich europium (Eu) accreted by the secondary via the wind from the supernova to be in proportion to the geometric fraction of the companion with respect to the exploding donor star, we find that the estimated yield of Eu (as representative of r-process elements) per AGB supernova event is about 1 x 10(-9)M(circle dot) similar to 0 5 x 10(-9)M(circle dot). Using the yields of Eu, the overabundance of r-process elements in CEMP-r/s stars can be accounted for. The calculated results show that the value of parameter f, standing for efficiency of wind pollution from the AGB supernova, will reach about 10(4), which means that the enhanced factor is much larger than unity due to the impact of gravity of the donor and the result of the gravitational focusing effect of the companion.
项目资助者National Natural Science Foundation of China(11273011,10973006,10821061,11033008,11103072,10973036,11003002) ; National Basic Research Program of China(2009CB824800) ; Chinese Academy of Sciences(KJCX2-YW-T24) ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences ; Natural Science Foundation of Hebei Province(A2012403006,A2011210017)
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0250-6335
URL查看原文
WOS记录号WOS:000329895400007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]METAL-POOR STARS ; NEUTRON-CAPTURE ELEMENTS ; LOW-METALLICITY STARS ; INTERMEDIATE-MASS STARS ; AGB STARS ; NUCLEOSYNTHESIS PROCESSES ; NUCLEAR-PHYSICS ; STELLAR MODELS ; GALACTIC HALO ; CARBON STARS
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9420
专题中国科学院天体结构与演化重点实验室
通讯作者Zhang, B (reprint author), Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China.
作者单位1.School of Mathematics and Science, Shijiazhuang University of Economics, Shijiazhuang, 050016, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China
3.Department of Physics, Hebei Normal University, Shijiazhuang, 050016, People’s Republic of China
推荐引用方式
GB/T 7714
Zhang, Jiang,Zhao, Fang,Chen, Yanping,et al. Puzzling Origin of CEMP-r/s Stars: An Interpretation of Abundance and Enrichment of s- and r-Process Elements from Asymptotic Giant Branch Supernovae[J]. JOURNAL OF ASTROPHYSICS AND ASTRONOMY,2013,34(4):373-391.
APA Zhang, Jiang,Zhao, Fang,Chen, Yanping,Cui, Wenyuan,Zhang, Bo,&Zhang, B .(2013).Puzzling Origin of CEMP-r/s Stars: An Interpretation of Abundance and Enrichment of s- and r-Process Elements from Asymptotic Giant Branch Supernovae.JOURNAL OF ASTROPHYSICS AND ASTRONOMY,34(4),373-391.
MLA Zhang, Jiang,et al."Puzzling Origin of CEMP-r/s Stars: An Interpretation of Abundance and Enrichment of s- and r-Process Elements from Asymptotic Giant Branch Supernovae".JOURNAL OF ASTROPHYSICS AND ASTRONOMY 34.4(2013):373-391.
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
Puzzling Origin of C(511KB)期刊论文作者接受稿开放获取CC BY-NC-SA浏览 请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Zhang, Jiang]的文章
[Zhao, Fang]的文章
[Chen, Yanping]的文章
百度学术
百度学术中相似的文章
[Zhang, Jiang]的文章
[Zhao, Fang]的文章
[Chen, Yanping]的文章
必应学术
必应学术中相似的文章
[Zhang, Jiang]的文章
[Zhao, Fang]的文章
[Chen, Yanping]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Puzzling Origin of CEMP-r_s Stars_ An Interpretation of Abundance and Enrichment of s- and r-Process Elements from Asymptotic Giant Branch Supernovae.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。