[42.02] Mapping the Local Galactic Halo: A Survey of Cool Subdwarfs in the Solar Neighborhood

AAS 207th Meeting, 8-12 January 2006
Session 42 Element and Stellar Evolution
Oral, Monday, 10:00-11:30am, January 9, 2006, Wilson A/B

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[42.02] Mapping the Local Galactic Halo: A Survey of Cool Subdwarfs in the Solar Neighborhood

J. L. Marshall (The Ohio State University)

I have conducted a survey of 745 cool halo subdwarf candidates. Generally presumed to be members of the Galactic halo, these metal-poor stars are of interest because they provide details about the halo population and thereby about Galactic structure and chemical evolution. New photometry of halo subdwarfs provides better characterization of the red end of the metal-poor main sequence color-magnitude diagram. From spectroscopic observations I have obtained spectral types, metallicities, and kinematics of the candidates. These data represent more accurate and complete measurements of the properties of halo subdwarfs than have been previously obtained.

This work has been supported in part by funds from NSF Grant AST-0205789.

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