Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..468s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, April 1, 1990, p. 468-474. Research supported by t
Other
52
Astronomical Models, Chemical Evolution, Spiral Galaxies, Star Formation, Viscosity, Abundance, Density Distribution, Dwarf Stars, G Stars, Metallicity, Star Formation Rate
Scientific paper
The chemical evolution of a star-forming viscous disk, taking into account the effects of radial flows and diffusion in the disk and infall on to the disk, is determined. The results obtained are compared with available constraints (chemical and others) from observational data on the galaxy. The constraints considered are the metallicity distribution of local G-dwarfs, the age-metallicity relation (AMR) of local stars, the radial distribution of stellar mean metallicity in the old disk and the radial distributions in the disk of stellar and gas surface densities, star-formation rate (SFR) and gas metallicity. The model is found to fit all the data adequately, including the metallicity distribution of local G-dwarfs, provided it is assumed that the disk initially was built up through infall of proto-galactic gas over a period of 4-6 Gyr. This indicates that the galaxy was formed on a time-scale considerably longer than the dynamical infall time-scale.
Sommer-Larsen Jesper
Yoshii Yuzuru
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