Kinematics of Nearby Subdwarf Stars

Details Kinematics of Nearby Subdwarf Stars Kinematics of Nearby Subdwarf Stars

2005-01-12

arxiv.org/abs/astro-ph/0501212v1

Astronomy and Astrophysics

Astrophysics

6 pages, 7 figures, accepted by Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20035829

We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, CLLA). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from CLLA. The kinematical behavior is discussed in particular in relation to their metallicities. The majority of these sample stars have metal abundances of [Fe/H] >-1 and represent the thick disk population. The halo component, with [Fe/H] <-1.6, is characterized by a low mean rotation velocity and a radially elongated velocity ellipsoid. In the intermediate metallicity range (-1.6 < [Fe/H] <-1), we find a significant number of subdwarfs with disklike kinematics. We interpret this population of stars as a metal-weak thick disk population.

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