First measurement of the uranium/thorium ratio in a very old star:: Implications for the age of the Galaxy

被引：0

作者：

Cayrel, R ^{[1
]}

Spite, M ^{[1
]}

Spite, F ^{[1
]}

Hill, V ^{[1
]}

Primas, F ^{[1
]}

François, P ^{[1
]}

Beers, TC ^{[1
]}

Plez, B ^{[1
]}

Barbuy, B ^{[1
]}

Andersen, J ^{[1
]}

Nordström, B ^{[1
]}

Molaro, P ^{[1
]}

Bonifacio, P ^{[1
]}

机构：

[1] Observ Paris, F-75014 Paris, France

来源：

ASTROPHYSICAL AGES AND TIME SCALES | 2001年 / 245卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

During an ESO-VLT large programme devoted to high resolution spectroscopy of extremely metal-poor stars selected from the HK survey of Beers and colleagues, the [Fe/H] = -2.9 giant CS 31082-001 was found to be as enriched in neutron-capture r-process elements as CS 22892-052 but with a much-reduced masking by molecular lines. This allowed the detection and measurement of the uranium line at 3859 Angstrom for the first time in a stellar spectrum. By making use of the relatively short U-238 decay (half-life 4.47 Gyr), we obtain a radioactive dating of the formation of the r-process elements in this star, born in the early days of the Galaxy.

引用

页码：244 / 251

页数：8

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