| Author(s): | Jahreiß, H., Fuchs, B., Wielen, R. |
| Title: | Kinematics of subdwarfs based on Hipparcos parallaxes and proper motions |
| Source: | In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and first astrophysical results of the Hipparcos space astrometry mission, Venice, Italy, 13-16 May 1997; ESA SP-402, Noordwijk, p. 587-590 |
| Year: | 1997 |
| Abstract: | Hipparcos parallaxes and proper motions were combined with radial velocities and metallicities from Carney et al. (1994). As a result a sample of 237 high-velocity stars was obtained having highly accurate space velocities and uniformly distributed metallicites. Hipparcos parallaxes show: (a) the Carney et al. (1994) sample is still contaminated by subgiants and giants. (b) the photometric distances in Carney et. al. (1994) were underestimated by about 16 per cent. The kinematical properties of these subdwarfs are discussed as a function of their metallicities. From an enlarged sample of subdwarfs, 93 halo subdwarfs could be selected indicating that a possible rotation of the galactic halo is improbable. |
| Preprint issued: | June 1997 |
| Remarks: |
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