Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..206c&link_type=abstract
Astronomy and Astrophysics, vol. 83, no. 1-2, Mar. 1980, p. 206-216. Research supported by the Consiglio Nazionale delle Ricerc
Astronomy and Astrophysics
Astrophysics
62
Astronomical Models, Chemical Composition, Disk Galaxies, Galactic Evolution, Galactic Structure, Milky Way Galaxy, Abundance, Gases, Gradients, Stellar Mass Accretion, Stellar Mass Ejection
Scientific paper
Using a simple description of the formation of the galactic disk by the accretion of primordial gas onto the equatorial plane, its chemical evolution during the life of the galaxy is followed. The results obtained for the solar neighborhood point out the sensitive dependence of the cumulative metal abundance distribution among stars on the time scale of mass accretion during the early epochs. Long time scales of the collapse phase are needed to account for the observed paucity of metal-deficient stars. The models predict radial gradients of gas surface mass density, and rates of star formation that agree with the observations. The satisfactory agreement that exists between these results and those derived by fully dynamical models casts light on the validity of such a simple approach to the chemical history of the galactic disk.
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