Isotopic Abundances of Eu, Ba, and Sm in Metal-Poor Stars

Details Isotopic Abundances of Eu, Ba, and Sm in Metal-Poor Stars Isotopic Abundances of Eu, Ba, and Sm in Metal-Poor Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916802r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #168.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We have examined the isotopic mix of the heavy neutron (n)-capture elements Eu, Ba, and Sm in three metal-poor stars with different enrichment histories. Isotopic abundances are more fundamental than elemental abundances as probes of the contributions from the rapid (r) and slow (s) nucleosynthesis reactions. We use our isotopic abundances in conjunction with elemental abundances of many heavy n-capture elements to constrain the nucleosynthetic history of these metal-poor stars. HD 122563 is a very metal-poor giant that has a clear underabundance of n-capture elements ([Fe/H]=-2.7, [Eu/Fe]=-0.5, [Ba/Fe]=-1.0). HD 175305 is a metal-poor giant that is enriched in r-process material ([Fe/H]=-1.5, [Eu/Fe]=+0.5). HD 196944 is a very metal-poor giant star that is enriched in s-process material ([Fe/H]=-2.3, [Ba/Fe]=+1.1). We have acquired new high-resolution (R 130,000) and high-S/N (S/N 160-1000) observations of these three stars with the 2.7m Harlan J. Smith Telescope at McDonald Observatory using the 2dcoude spectrograph. We present our measurements of the isotopic abundances of Eu, Ba, and Sm in these three stars. This research has been supported by U.S. National Science Foundation grants AST 03-07495 and AST 06-07708.

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