Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-15
Astrophys.J.660:L117-L120,2007
Astronomy and Astrophysics
Astrophysics
7 pages, 2 figures. Accepted for publication in ApJ Letters
Scientific paper
10.1086/518122
We present age estimates for the newly discovered very r-process enhanced metal-poor star HE 1523-0901 ([Fe/H]=-2.95) based on the radioactive decay of Th and U. The bright (V=11.1) giant was found amongst a sample of bright metal-poor stars selected from the Hamburg/ESO survey. From an abundance analysis of a high-resolution (R=75,000) VLT/UVES spectrum we find HE 1523-0901 to be strongly overabundant in r-process elements ([r/Fe]=1.8). The abundances of heavy neutron-capture elements (Z>56) measured in HE 1523-0901 match the scaled solar r-process pattern extremely well. We detect the strongest optical U line at 3859.57 A. For the first time, we are able to employ several different chronometers, such as the U/Th, U/Ir, Th/Eu and Th/Os ratios to measure the age of a star. The weighted average age of HE 1523-0901 is 13.2 Gyr. Several sources of uncertainties are assessed in detail.
Beers Timothy C.
Christlieb Norbert
Frebel Anna
Norris John. E.
Rhee Jaehyon
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