Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983azh....60..487l&link_type=abstract
Astronomicheskii Zhurnal, Vol. 60, P. 487, 1983
Astronomy and Astrophysics
Astronomy
1
Scientific paper
An investigation of residual velocities of 369 B-type stars in the solar neighbourhood has been made. For each star, an estimate of the epicyclic amplitude is obtained, the frequency distribution of these quantities is constructed. On the Lindblad diagram of the sample stars the condensations of stars with similar values of the plane motion integrals have been distinguished, thus allowing to use the formulae of the epicyclic approximation for obtaining a direct estimate of the epicyclic frequency κ. The obtained value of κ = 50.0 ± 8.7 km/s kpc is by a factor of 2 larger than the frequency of rotation of the Galaxy in the solar neighbourhood; thus the galactic orbits of the stars are nearly closed. The coefficient of correlation between the excess energy of the motion of the star and its mass is calculated. It does not differ significantly from zero, leading to a conclusion on the equipartition of energy of B-type stars per unit mass.
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