Elemental Abundances of Metal-Poor Thick Disk RAVE Stars

Details Elemental Abundances of Metal-Poor Thick Disk RAVE Stars Elemental Abundances of Metal-Poor Thick Disk RAVE Stars

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..383r&link_type=abstract

NOAO Proposal ID #2007A-0383

Physics

Scientific paper

Theories of thick disk formation can be differentiated by observable abundance ratios. Old metal-poor stars in a thick disk made during the accretion of satellite galaxies may show abundance ratio variations as a function of galactic radius. If the thick disk formed during a slow dissipational collapse, abundance ratio gradients may exist in the metal- poor stars in the vertical direction. Conversely, a thick disk made in a burst of high star formation should have a more uniform abundance ratio distribution, but lack the most metal-poor stars. Therefore, we propose to observe a sample of up to 100 metal-poor thick disk stars selected from the RAVE survey. These stars cover a range of positions within the Galaxy in order to test whether the distribution of their abundance ratios are consistent with any of the present theories of thick disk formation.

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