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

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dc.creatorFrebel, Anna
dc.creatorChristlieb, Norbert
dc.creatorNorris, John E.
dc.creatorThom, Christopher
dc.creatorBeers, Timothy C.
dc.creatorRhee, Jaehyon
dc.date2007-03-15
dc.date.accessioned2026-07-07T11:01:06Z
dc.date.available2026-07-07T11:01:06Z
dc.descriptionWe 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.
dc.description7 pages, 2 figures. Accepted for publication in ApJ Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/0703414
dc.identifierhttp://arxiv.org/abs/astro-ph/0703414
dc.identifierAstrophys.J.660:L117-L120,2007
dc.identifierdoi:10.1086/518122
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/187859
dc.subjectAstrophysics
dc.titleDiscovery of HE 1523-0901, a Strongly r-Process Enhanced Metal-Poor Star with Detected Uranium
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