Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..373c&link_type=abstract
Astrophysics and Space Science, vol. 84, no. 2, June 1982, p. 373-400. Research supported by the Consiglio Nazionale delle Rice
Astronomy and Astrophysics
Astrophysics
8
Astronomical Models, Chemical Evolution, Galactic Evolution, Galactic Structure, Abundance, Metals, Space Density, Stellar Evolution, Stellar Mass, Sun
Scientific paper
An attempt is made to incorporate two different types of models into a single chemical-evolution scheme for two-component galaxies: the S models which allow mass conservation, and the I models which allow initial zero masses and no mass conservation due to gas inflow. If the stellar birthrate function is assumed to be a universal law, the chemical evolution of the Galactic disk may be understood in terms of different zones (which can be represented as concentric and coaxial rings) the total density of which decreases monotonically, owing to a corresponding decrease in total mass and/or increase in volume, when passing from the center to the border of the disk. Concerning the Galactic spheroidal component, it is found that only S models with massive halos are able to acceptably reproduce the empirical metal abundance distribution.
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