Journal
ASTRONOMICAL JOURNAL
Volume 134, Issue 6, Pages 2418-2429Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/522053
Keywords
Galaxy : kinematics and dynamics; Galaxy : structure; stars : fundamental parameters; stars : low-mass, brown dwarfs
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We have assembled a spectroscopic sample of low-mass dwarfs observed as part of the Sloan Digital Sky Survey along one Galactic sight line, designed to investigate the observable properties of the thin and thick disks. This sample of similar to 7400 K and M stars also has measured ugriz photometry, proper motions, and radial velocities. We compute UVW space-motion distributions, and investigate their structure with respect to vertical distance from the Galactic plane. We place constraints on the velocity dispersions of the thin and thick disks, using two-component Gaussian fits. We also compare these kinematic distributions to a leading Galactic model. Finally, we investigate other possible observable differences between the thin and thick disks, such as color, active fraction, and metallicity.
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