Kinematics of B and A stars. II - Local velocity field derived from proper motions and radial velocities

Details Kinematics of B and A stars. II - Local velocity field derived from proper motions and radial velocities Kinematics of B and A stars. II - Local velocity field derived from proper motions and radial velocities

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36..261p&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, Sept. 1985, p. 261-267.

Astronomy and Astrophysics

Astronomy

5

A Stars, B Stars, Radial Velocity, Stellar Motions, Oort Cloud, Star Distribution, Velocity Distribution

Scientific paper

The local velocity fields of three types of A-type and B-type stars have been derived from the stellar proper motions and radial velocities. The local velocity fields were fitted to the Oort-Linblad model of galactic rotation, and the results are discussed. The motion of 440 stars younger than 5 x 10 to the 7th years yielded a velocity field for A-type stars of 9.1 + or -4.0 km/s. per kpc, and a B-type velocity field of -15.7 + or -3.6 kms per kpc, with l(0) = 91 + or -21 degrees. The velocity field of the A-type stars, which was derived from the radial velocities was 8.6 + or -1.9 km/s per kpc, 1(0) = -26 + or -7 degrees. The results are used to explain the observations of Tsioumis and Fricke (1979) of differences the velocity fields of type A stars which are derived from proper motions and radial velocities respectively. It is shown that the Oort-Linblad model of galactic rotation does not apply to young stars, due to the large degree of error in the kinematic parameters.

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