SIMBAD references

2007ApJ...660L.117F - Astrophys. J., 660, L117-L120 (2007/May-2)

Discovery of HE 1523-0901, a strongly r-process-enhanced metal-poor star with detected uranium.

FREBEL A., CHRISTLIEB N., NORRIS J.E., THOM C., BEERS T.C. and RHEE J.

Abstract (from CDS):

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 among 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 Å. 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.

Abstract Copyright:

Journal keyword(s): Cosmology: Early Universe - Galaxy: Halo - Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances - stars: individual (HE 1523-0901)

Simbad objects: 3

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2021.04.23-13:17:58

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