Elemental Abundances of Metal-Poor Thick Disk Stars from the RAVE Survey

Details Elemental Abundances of Metal-Poor Thick Disk Stars from the RAVE Survey Elemental Abundances of Metal-Poor Thick Disk Stars from the RAVE Survey

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532102r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #321.02; Bulletin of the American Astronomical Society, Vol. 42, p.322

Astronomy and Astrophysics

Astronomy

Scientific paper

Detailed elemental abundances reveal the history of chemical enrichment and contain much more information than overall metallicity, and can discriminate among different models of Galaxy evolution. Old metal-poor stars in a thick disk created by direct accretion of stars from satellite galaxies should show low alpha-enhancement and abundance ratio variations as a function of Galactic radius. If the thick disk formed during a slow dissipational collapse, abundance ratio gradients should exist in the vertical direction. A thick disk made in a burst of high star formation should have a uniform abundance ratio distribution and enhanced [Alpha/Fe], but contain few metal-poor stars. We test these scenarios through derived elemental abundances from high resolution echelle spectroscopic observations of a large sample of candidate metal-poor thick disk stars selected from the RAVE spectroscopic survey. Funding for this research, provided by the National Science Foundation through AST-0508996 and AST-0908326 as well as the Keck and Moore Foundations, is gratefully acknowledged.

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