Dynamical evolution of Galactic disk stars due to giant molecular clouds and spiral density waves. II

Details Dynamical evolution of Galactic disk stars due to giant molecular clouds and spiral density waves. II Dynamical evolution of Galactic disk stars due to giant molecular clouds and spiral density waves. II

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43....9y&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 1, 1991, p. 9-25.

Astronomy and Astrophysics

Astronomy

4

Density Wave Model, Molecular Clouds, Stellar Evolution, Gravitational Effects, Milky Way Galaxy, Perturbation, Stellar Motions

Scientific paper

The dynamical evolution is followed of disk stars perturbed by giant molecular clouds (GMCs) and spiral density waves in a three-dimensional potential of the Galaxy. It is shown that GMCs scatter stars and cause them to drift slowly outward. The drift velocity is smallest at about 5 kpc of the Galactic center and increases with radial distance. When GMCs are distributed in the shape of a ring, stars are perturbed so as to converge on the ring and, particularly, when spiral density waves are superimposed, systematic drift is considerably enhanced. The resultant velocity dispersion of disk stars is at most about 40 km/s in 10 billion yr. The vertex deviation of the stellar velocity ellipsoid is a sensitive probe which can be used to examine the mass of a GMC.

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