Other
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..365d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 15, 1984, p. 365-377. Research supported by th
Other
45
Chemical Evolution, Galactic Evolution, Oxygen, Spiral Galaxies, Abundance, Andromeda Galaxy, Hydrogen Clouds, Milky Way Galaxy, Star Formation Rate, Stellar Evolution
Scientific paper
The authors investigate a certain class of numerical chemical evolution models characterized by different combinations of the two parameters: star formation rate and infall of gas, with the aim of reproducing the observed oxygen abundances throughout the discs of the Galaxy and four other spirals: M31, M33, M83 and M101. Good agreement between models and observations is attained for all galaxies, except M33, by adopting oxygen yields corresponding to stellar evolution models with mass loss. The best fit parameters to the observed oxygen gradients in their discs imply a star formation rate which is almost constant for all the galaxies except M101, for which it seems to be rapidly decreasing with time. The infall of gas, assumed uniform and constant, should be in the range 0 - 5×10-3 M_sun; kpc-2 yr-1.
Diaz Angeles I.
Tosi Mia
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