CNO isotopes and galactic chemical evolution

Abstract

view Abstract Citations (77) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS CNO isotopes and galactic chemical evolution Tosi, M. Abstract 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. Publication: The Astrophysical Journal Pub Date: March 1982 DOI: 10.1086/159782 Bibcode: 1982ApJ...254..699T Keywords: 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; Astrophysics full text sources ADS |