Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110316p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #103.16; Bulletin of the American Astronomical Society, Vol. 39, p.922
Other
Scientific paper
The origin and distribution of r-process elements in the Milky Way are poorly understood. To unravel the chemical evolution history of the Galaxy, we are working to measure the abundances of europium and other r-process elements in solar-metallicty Galactic thin disk stars. With nearly one thousand S/N 100 Keck I HIRES spectra of stars with 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 ongoing abundance analysis of europium in nearby (d < 100 pc) F, G, and K stars, abundances determined with an LTE spectral synthesis code. We include for comparison our fit to the Eu lines in the sun and in a handful of stars that have been 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 has been supported by a NASA grant managed by the University of California at Berkeley.
Marcy Geo? W.
Peek Kathryn M. G.
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