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
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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.
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页码:244 / 251
页数:8
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