NAOC Open IR
radioactiveagesofmetalpoorhalostars
Li Ji; Zhao Gang
2004
Source Publicationchinesejournalofastronomyandastrophysics
ISSN1009-9271
Volume4Issue:1Pages:75
AbstractThe abundances of long-lived radioactive elements Th and U observed in metal-poor halo stars can be used as chronometers to determine the age of individual stars, and hence set a lower limit on the age of the Galaxy and hence of the universe. This radioactive dating requires the zero-decay productions of Th and U, which involves complicated r-process nucleosynthesis calculations. Several parametric r-process models have been used to calculate the initial abundance ratios of Th/Eu and U/Th, but, due to the sharp sensitivity of these models to nuclear physics inputs, the calculations have relatively large uncertainties which lead to large uncertainties in the age determinations. In order to reduce these uncertainties, we present a simple method to estimate the initial productions of Th and U, which only depends on the solar system abundances and the stellar abundances of stable r-process elements. From our calculations of the initial abundance ratios of Th/Eu and U/Th, we re-estimate the ages of those very metal-poor halo stars with published abundances of Th and U. Our age estimates are consistent, Within the errors, with the other age determinations derived from r-process models, and offer useful constrains for r-process theoretical calculations. The advantages and limitations of our simple method of radioactive dating are discussed.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/47896
Collection中国科学院国家天文台
Affiliation中国科学院国家天文台
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li Ji,Zhao Gang. radioactiveagesofmetalpoorhalostars[J]. chinesejournalofastronomyandastrophysics,2004,4(1):75.
APA Li Ji,&Zhao Gang.(2004).radioactiveagesofmetalpoorhalostars.chinesejournalofastronomyandastrophysics,4(1),75.
MLA Li Ji,et al."radioactiveagesofmetalpoorhalostars".chinesejournalofastronomyandastrophysics 4.1(2004):75.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Li Ji]'s Articles
[Zhao Gang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Li Ji]'s Articles
[Zhao Gang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Li Ji]'s Articles
[Zhao Gang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.