Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67...21g&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 21-32. In Russian.
Astronomy and Astrophysics
Astronomy
3
A Stars, B Stars, F Stars, Milky Way Galaxy, Relaxation Time, Angular Velocity, Distribution Functions, Galactic Structure, Interstellar Gas, Stellar Evolution, Velocity Distribution
Scientific paper
The distribution function of B5-A9 and F stars according to peculiar (chaotic) velocities is used to study the relaxation time of the Galaxy's stellar disk in the vicinity of the solar system. The relaxation mechanism proposed by Spitzer and Schwarzschild (1953) is discussed, focusing on the hypothesis that the mechanism is due to collisions between stars and giant clouds of interstellar gas. The results are used to propose a two-phase relaxation process for stars in the Galaxy. The first phase, which lasts a trillion years, includes the Maxwellization of the chaotic velocities distribution function and the establishment of a fundamental relation between the ratio of radial dispersion to azimuthal dispersion and the ratio of angular velocity to epicyclic frequency. In the second phase, which exceeds the age of the universe, the distribution function becomes equilibrium.
Fridman Alexei M.
Grivnov E. M.
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