Thorium Ages for Extremely Metal-Poor Stars

Details Thorium Ages for Extremely Metal-Poor Stars Thorium Ages for Extremely Metal-Poor Stars

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1301j&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #13.01; Bulletin of the American Astronomical Society, Vol. 29, p.1229

Astronomy and Astrophysics

Astronomy

Scientific paper

By measuring the abundance of the radioactive isotope thorium-232 (Z=90), Sneden, et al. (1996) found a lower limit of 15 Gyrs to the age of CS 22892-052, a metal-poor giant. Their estimate of the initial thorium abundance was based on a detailed study of many neutron-capture elements, up to Z=76, which matched a scaled solar system r-process pattern. We have obtained Keck HIRES data for a larger sample of field giants and show the results for two stars here: HD 115444 ([Fe/H] ~ -3.0) and HD 108577 ([Fe/H] ~ -2.3). We present abundances for heavy elements in these two stars to check whether the solar-system r-process pattern is indeed invariant, to test the extrapolation from Z ~ 70 to Z=90, and to determine the ages of two more metal-poor stars.

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