Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254..699t&link_type=abstract
Astrophysical Journal, Part 1, vol. 254, Mar. 15, 1982, p. 699-707. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
62
Abundance, Carbon Isotopes, Chemical Evolution, Cosmochemistry, Galactic Evolution, Interstellar Gas, Metals, Milky Way Galaxy, Nitrogen Isotopes, Nuclear Fusion, Oxygen Isotopes, Radial Distribution, Star Formation Rate, Stellar Evolution
Scientific paper
An attempt is made to reproduce the observed radial distribution of the metal abundances and the age-metallicity relation in the disk of the Galaxy with theoretical models without introducing new ad hoc assumptions or giving up realistic constraints on the principal evolutionary parameters. It is found that the model in best agreement with the observed metallicity gradient and age-metallicity relation is based on a constant star formation rate and a flux of incoming metal-free gas for all disk regions. The models accurately account for the observed time increase of the metallicity gradients and suggest steeper gradients in the outer parts of the Galaxy. The agreement between the computed and observed abundance radial variation is excellent. Model calculations indicate that primary/secondary evolution element ratios decrease with time and have a positive radial gradient.
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