Kinematics of subdwarfs based on HIPPARCOS parallaxes and proper motions

Details Kinematics of subdwarfs based on HIPPARCOS parallaxes and proper motions Kinematics of subdwarfs based on HIPPARCOS parallaxes and proper motions

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..587j&link_type=abstract

In: B. Battrick, M.A.C. Perryman and P.L. Bernacca (eds.): HIPPARCOS '97. Presentation of the Hipparcos and Tycho catalogues and

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

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 determined metallicities. 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.

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