A Deep In Situ Study of the Thick Disk and Thin Disk Populations

Details A Deep In Situ Study of the Thick Disk and Thin Disk Populations A Deep In Situ Study of the Thick Disk and Thin Disk Populations

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..248l&link_type=abstract

NOAO Proposal ID #1999B-0248

Physics

Scientific paper

Are the thin disk and thick disk stellar populations ancestral or merely neighbors by chance? We seek to help answer this fundamental question through a large study of long-lived late G dwarfs situated in three key directions: b=+47°, and ℓ=3°, 168°, and 278°. Proper motions have been measured for all stars over 7 to 21 square degrees down to V=18 mag. Based on new Schmidt/CCD photometry, we have selected targets for high-resolution but low-S/N echelle spectroscopy. From the resultant metallicities and space velocities, we will study the ``smoothness" of the metallicity vs. kinematics relations, as well as the existence or lack of metallicity gradients.

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