Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..260p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 260-267.
Astronomy and Astrophysics
Astrophysics
50
A Stars, B Stars, Galactic Structure, Halos, Stellar Motions, Anisotropy, Globular Clusters, Metallicity, Spatial Distribution, Subdwarf Stars
Scientific paper
Solar motion and velocity ellipsoid solutions are presented for a sample of 150 halo field stars selected with no proper motion or velocity discriminants. The results indicate that the halo does not partake in the rotation of the disk (there is mild evidence for a systematic retrograde motion) and that the velocities are moderately anisotropic in that they are elongated in the radial direction. A higher solar motion is found for that half of the sample which is most metal poor. By drawing from the literature, a combined halo sample of approximately 400 objects gives a solar motion of -199 km/s (-122 km/s for the 200 most metal-poor objects). The anisotropy noted for the AB stars is sustained by the combined sample. It is argued that flattening of the spheriod would tend to make the velocity distribution more isotropic, which implies that at the time of collapse the velocities were highly anisotropic (dominantly radial).
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