Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ap%26ss..58..389b&link_type=abstract
Astrophysics and Space Science, vol. 58, no. 2, Oct. 1978, p. 389-408.
Astronomy and Astrophysics
Astrophysics
Abundance, Globular Clusters, Gravitational Effects, Interstellar Gas, Iron, Stellar Evolution, Astronomical Models, Chemical Composition, Elliptical Galaxies, Hydrogen
Scientific paper
The gravitational separation for iron atoms with respect to hydrogen is evaluated by simple models of globular clusters and spherical galaxies before star formation, as well as in a column of gas perpendicular to the galactic plane in the solar neighborhood. The changes of the iron abundance are small, but qualitatively consistent with the observed facts: (1) there is a positive correlation between the mass number of the element and the steepness of its abundance gradient; (2) there is a connection between the mass and the density concentration of the globular clusters and their chemical composition; (3) the changes of the chemical content in the galactic plane are very small during the life of the galactic disk, but are increasingly significant in the upper layers.
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