检索结果-南通市图书馆

Neutron-Capture Elements in the Double-Enhanced Star HE 1305-0007： a New s- and r-Process Paradigm

Chinese Physics Letters 2007年第5期24卷 1417-1420页

作者：崔文元崔冬暖杜云霜张波 Department of Physics Hebei Normal University Shijiazhuang 050016 National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 Graduate School of the Chinese Academy of Sciences Beijing 100049

The star HE 1305-0007 is a metal-poor double-enhanced star with metallicity [Fe/H] = -2.0, which is just at the upper limit of the metallicity for the observed double-enhanced stars. Using a parametric model, we find that almost all s-elements were made in a single neutron exposure. This star should be a member of a post-commonenvelope binary. After the s-process material has experienced only one neutron exposure in the nucleosynthesis region and is dredged-up to its envelope, the AGB evolution is terminated by the onset of common-envelope evolution. Based on the high radial-velocity of HE 1305-0007, we speculate that the star could be a runaway star from a binary system, in which the AIC event has occurred and produced the r-process elements.

关键词： ASYMPTOTIC GIANT BRANCH metal-poor stars RICH stars GALACTIC HALO CARBONstars DREDGE-UP EVOLUTION NUCLEOSYNTHESIS MODEL ORIGIN

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Influence of nuclear physics inputs on the Th/U chronometer

Influence of nuclear physics inputs on the Th/U chronometer

引用

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： Zhongming Niu~(1 1)) Baohua Sun~(2,3 2)) Jie Meng~(1,2,4 3)) 1(State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University, Beijing 100871,People's Republic of China) 2(School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,People's Republic of China) 3(Justus-Liebig-Universitat Giessen,Heinrich-Buff-Ring 14,D-35392 Giessen,Germany) 4(Department of Physics,University of Stellenbosch,Stellenbosch,South Africa)

The productions of thorium and uranium are key ingredients in r-process nucleo-cosmochronology. With the combination of improved nuclear and stellar data,we have made a detailed investigation of the r-process abundance pattern in the very metal-poor halo stars based on the classical r-process *** is found that the influence from nuclear mass uncertainties on a Th/U chronometer can approach 2 Gyr. Moreover,the ages of the metal-poor stars HE 1523-0901,CS 31082-001,and BD +17°3248 are determined as 11.8±3.7,13.5±2.9,and 10.9±2.9 Gyr,*** results can serve as an independent check for age estimates of the Universe.

关键词： chronometer r-process nuclear masses metal-poor stars

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Influence of nuclear physics inputs on the Th/U chronometer

Influence of nuclear physics inputs on the Th/U chronometer

引用

第十四届全国核物理大会暨第十届会员代表大会

作者： Zhongming Niu1 Baohua Sun2 3 Jie Meng1 2 4 1 State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People’s Republic of China 2 School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, People’s Republic of China 3 Justus-Liebig-Universit?t Giessen, Heinrich-Buff-Ring 14, D-35392 Giessen, Germany 4 Department of Physics, University of Stellenbosch, Stellenbosch, South Africa

The productions of thorium and uranium are key ingredients in r-process *** the combination of improved nuclear and stellar data,we have made a detailed investigation of the r-process abundance pattern in the very met... 详细信息

关键词： chronometer r-process nuclear masses metal-poor stars

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：