Other
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..616t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.4/OCT15, P. 616, 1990
Other
11
Scientific paper
The possibility of assuming the star formation-rate ψ in spiral discs to be proportional to their H_2_ density is analysed. Since a good correlation between the molecular gas fraction and the logarithm of the oxygen abundance is derived from sample of several nearby spirals, we examine in particular the possibility that ψ is proportional to {SIGMA}H_2_/{SIGMA}_gas_ is proportional to (o/H). Numerical models have been computed to evaluate the implications on the chemical evolution of spiral galaxies of two alternative assumptions on this kind of star formation rate. In one case ψ is always proportional only to H_2_ through the empirical relation found with the oxygen abundance, and in the other it is proportionate to both the H_2_ and the total gas density. Model results are presented for the Galaxy and for the spirals M 31, M 83, M 101 and NGC 2403. It is found that some of these models' predictions are in less good agreement with the data than those based on star-particular, the assumption of bimodal dependence of the star formation on the two gas components applies rather well to the galaxies in our sample. However, the models' predictions are in less good agreement with the data than those based on star-formation rates exponentially decreasing with time.
Diaz Angeles I.
Tosi Mia
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