Stochastic star formation and chemical evolution of dwarf irregular galaxies

Details Stochastic star formation and chemical evolution of dwarf irregular galaxies Stochastic star formation and chemical evolution of dwarf irregular galaxies

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..121m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 121-134. Research supported by the Consiglio Naziona

Astronomy and Astrophysics

Astrophysics

115

Chemical Evolution, Dwarf Galaxies, Galactic Evolution, Star Formation, Astronomical Models, Astronomical Photometry, Metallicity, Star Formation Rate, Stochastic Processes, Ubv Spectra

Scientific paper

The Gerola et al. (1980) stochastic self-propagating star formation model is the basis of the present discussion of the observational properties of a sample of magellanic and dwarf irregular galaxies. One-zone model galaxies are presented which take into account both the bursting mode of star formation and the inflow of unenriched gas, where the rate of star formation is assumed to depend on both a stochastic term representing the fraction of active cells in the Gerola model and the current fractionary mass of gas. Models for the SMC and LMC are used in choosing among different solutions and in fixing an efficiency factor in the star formation rate, the underlying initial mass function, and the time scale of mass accretion. It is found that the high dispersion rate of observed dwarf irregular galaxy properties cannot be explained by means of the stochastic star formation mechanism alone.

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