Discovery of HE 1523-0901, a Strongly r -Process-enhanced Metal-poor Star with Detected Uranium | Zendy

Anna Frebel | Zendy; N. Christlieb | Zendy; John E. Norris | Zendy; Christopher Thom | Zendy; Timothy C. Beers | Zendy; Jaehyon Rhee | Zendy

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Discovery of HE 1523-0901, a Strongly r -Process-enhanced Metal-poor Star with Detected Uranium

Author(s) -

Anna Frebel,

N. Christlieb,

John E. Norris,

Christopher Thom,

Timothy C. Beers,

Jaehyon Rhee

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/518122

Subject(s) - astrophysics , metal , physics , stars , uranium , star (game theory) , r process , nucleosynthesis , chemistry , radiochemistry , analytical chemistry (journal) , nuclear chemistry , materials science , nuclear physics , metallurgy , environmental chemistry

We present age estimates for the newly discovered very r-process enhancedmetal-poor star HE 1523-0901 ([Fe/H]=-2.95) based on the radioactive decay ofTh and U. The bright (V=11.1) giant was found amongst a sample of brightmetal-poor stars selected from the Hamburg/ESO survey. From an abundanceanalysis of a high-resolution (R=75,000) VLT/UVES spectrum we find HE 1523-0901to be strongly overabundant in r-process elements ([r/Fe]=1.8). The abundancesof heavy neutron-capture elements (Z>56) measured in HE 1523-0901 match thescaled solar r-process pattern extremely well. We detect the strongest opticalU line at 3859.57 A. For the first time, we are able to employ severaldifferent chronometers, such as the U/Th, U/Ir, Th/Eu and Th/Os ratios tomeasure the age of a star. The weighted average age of HE 1523-0901 is 13.2Gyr. Several sources of uncertainties are assessed in detail.Comment: 7 pages, 2 figures. Accepted for publication in ApJ Letter

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