Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..90..277b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 90, no. 2, Feb. 1983, p. 277-298.
Astronomy and Astrophysics
Astrophysics
Chemical Evolution, Galactic Evolution, Globular Clusters, Mass Distribution, Metallicity, Milky Way Galaxy, Astronomical Models, Galactic Structure, Gas Ionization, Halos, Hot Stars, Hydrogen Clouds, Interstellar Gas, Nuclear Fusion, Stellar Evolution
Scientific paper
The distribution of metals in globular clusters and in the stars of the bulge component of the Galaxy are reproduced by means of galactic halo chemical evolution models giving particular attention to the observed Z(N) relation. Following Hartwick's (1976) demonstration that chemical distributions of the type observed for population II stars can be theoretically reproduced if mass is temporarily removed from the star-forming regions, two alternative mass segregation mechanisms are proposed to account for this phenomenon: the first being derived from the different dynamical behavior of the gas and the stars, and the second from consideration of a star formation law conditioned by the ionization of early-type stars. Models based on simple schematizations of the phenomena to which the two mass segregation mechanisms give rise, as well as on an initial mass function allowing for high M/L ratios, are found to reproduce observational data for both metal abundances and mass distributions.
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