Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175...50s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 50-53.
Astronomy and Astrophysics
Astrophysics
2
Galactic Evolution, Milky Way Galaxy, Molecular Clouds, Star Distribution, Velocity Distribution, Density Wave Model, Halos, Solar Neighborhood, Stellar Evolution
Scientific paper
A self-consistent justification is presented for Wielen's (1977) suggestion that an average cloud density decay of the order of 5 billion years yields good agreement with observational data. The framework used is the scattering-off-giant-molecular-cloud model explanation of the time evolution law for disk star velocity dispersion. The density decay could be accounted for either by a very slow gradual diffusion of the cloud medium into a larger volume than the present, or by an actual decrease in their masses due to the fact that the destruction-reformation cycle is not perfectly stationary.
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