Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.2203s&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #22.03; Bulletin of the American Astronomical Society, Vol. 27, p.841
Astronomy and Astrophysics
Astronomy
Scientific paper
New high resolution, high S/N spectra have been obtained for the halo K-giant star CS 22892-052. Our previous analysis of a high resolution but low S/N spectrum of this star showed that it has a very low metallicity ([Fe/H] ~ -3), and that the abundance pattern for nearly all elements with Z<30 is normal for a metal-poor star. But the elements with Z>30 are all very overabundant with respect to iron. The overabundances of the heaviest elements rise with increasing Z, indicating their creation in an r-process neutron capture nucleosynthesis environment. With our new spectra of CS 22892-052 we derive the most complete neutron capture element abundance set of any very metal-poor star. This new abundance set includes the seldom-observed rare earth elements erbium and ytterbium, and the first abundance determination of holmium in a metal-poor star. Thorium is cleanly detected in the CS 22892-052 spectrum. Abundance upper limits are derived for additional elements of nucleosynthesis interest. The observed abundance pattern is compared to the predictions of supernova r-process nucleosynthesis, and a galactic halo age estimate is derived from the thorium abundance. This work was partially supported with funds from NSF grant AST 93-15068.
Cowan John J.
McWilliam Andrew
Preston George W.
Sneden Chistopher
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