Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7403p&link_type=abstract
American Astronomical Society Meeting 210, #74.03; Bulletin of the American Astronomical Society, Vol. 39, p.181
Other
Scientific paper
The origin of r-process elements in the Milky Way is poorly understood. We measure the abundance of europium, an r-process element, in Galactic thin disk stars. With nearly one thousand Keck I HIRES spectra for stars that have 0.5 < B-V < 1.5 and -0.5 < [Fe/H] < 0.5, we expect to place strong constraints on the origin of the r-process, both in spatial distribution and through the Galaxy's history. We present here progress to date in an abundance analysis of europium in nearby (d < 100 pc) F, G, and K stars, derived from an LTE spectral synthesis code. As an s-process marker, we also present an analysis of lanthanum abundance in the same stars. We include for comparison our fit to the Eu and La lines in the sun and in eighteen stars previously measured in literature abundance work. Our europium abundances lay the foundation for future investigation of lines from other elements, like the pure r-process element thorium. With these techniques in hand, we hope to establish an r-process abundance pattern derived from hundreds of solar-type stars, and use relative abundances of r-process and s-process elements to gain insight into the history of heavy-element nucleosynthesis in the solar neighborhood.
This work is supported by a NASA grant managed by the University of California at Berkeley.
Marcy Geoff
Peek Kathryn M.
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