Kinematics of hot subdwarfs

Details Kinematics of hot subdwarfs Kinematics of hot subdwarfs

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287...38c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. 38-42

Astronomy and Astrophysics

Astrophysics

8

Astrometry, Distance, Kinematics, Mass Distribution, Radial Velocity, Subdwarf Stars, Astronomical Catalogs, Astronomical Photography, Error Analysis, Globular Clusters, Milky Way Galaxy, Stellar Evolution

Scientific paper

We present the first results from a larger project in which kinematics of hot subdwarfs are investigated. Proper motions are being determined for blue halo stars based on Carte du Ciel and recent plates. These, together with radial velocities (new data are presented), distances (from the literature), and a mass model for the galaxy, lead to the determination of the space motions of these objects. The kinematics of hot subdwarfs will be used for a determination of the population membership of these stars. The present small sample shows subdwarfs with a kinematical behavior very similar to that of disk globular clusters. One of the objects has an apparent orbit reaching to z greater than 8 kpc and is thus a candidate Population II star; the other ojects stay at z less than 3 kpc.

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