Fuchs
- Silvia Rossi
title: 'Kinematics of Metal-Poor Stars in the Galaxy. II. Proper Motions for a Large Non-Kinematically Selected Sample'
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Introduction
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Studies of the kinematics of various stellar populations in the Galaxy, in particular the thick disk and the nascent halo, have long been limited by the availability of large samples of stars with measurements of velocities, distances, and metallicities. Such a database is required in order to constrain plausible scenarios for the formation and evolution of the Milky Way and other large spiral galaxies like it. Current issues which might be addressed with such data include: (a) the rotational character of the thick disk and halo (see, e.g., Beers & Sommer-Larsen 1995, hereafter BSL, and references therein), (b) the existence and the observed lower limit on the metal abundance of stars in the so-called metal-weak thick disk (MWTD) (Morrison, Flynn, & Freeman 1990, hereafter MFF; BSL; Carney et al. 1996; Chiba & Yoshii 1998; Martin & Morrison 1998) (c) a dual-component (flattened plus spherical) halo population in the Galaxy (Hartwick 1987; Sommer-Larsen & Zhen 1990; Norris 1994; Kinman, Suntzeff, & Kraft 1994; Sommer-Larsen et al. 1997), (d) quantitative estimates of the local density of thick disk 