Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-11-27
Astrophys.Space Sci. 265 (1999) 175-178
Astronomy and Astrophysics
Astrophysics
Latex, 4 pages, 6 figures. To appear in the proceedings of the `Galaxy Evolution' conference held in Meudon, September, 21 - 2
Scientific paper
10.1023/A:1002190906018
A sample of subdwarfs with accurate space velocities and standarized metallicities is presented. This was constructed by combining Hipparcos parallaxes ond proper motions with radial velocities and metallicities from Carney et al. (1994; CLLA). The accurate Hipparcos parallaxes lead to an - upward - correction factor of 11% of the photometric distance scale of CLLA. The kinematical behaviour of the subdwarfs is discussed in particular in relation to their metallicities. Most of the stars turn out to be thick disk stars, but the sample contains also many genuine halo stars. While the extreme metal poor halo does not rotate, a population of subdwarfs with metallicities in the range -1.6 < [Fe/H] < -1.0 dex appears to rotate around the galactic center with a mean rotation speed of about 100 km/s.
Fuchs Bernard
Jahreiss Hartmut
Wielen Roland
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