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Astron. Astrophys. 350, 827-839 (1999)

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On star formation and chemical evolution in the Galactic disc

L. Portinari and C. Chiosi

Department of Astronomy, University of Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy (portinari, chiosi@pd.astro.it)

Received 10 June 1999 / Accepted 26 August 1999

Abstract

The abundance gradients and the radial gas profile of the Galactic disc are analysed by means of a model for the chemical evolution of galaxies. As one of the major uncertainties in models for galaxy evolution is the star formation (SF) process, various SF laws are considered, to assess the response of model predictions to the different assumptions. Only some SF laws are successful in reproducing the metallicity gradient, and only if combined with a suitable infall timescale increasing outward (inside-out formation scenario). Still, it is difficult to reproduce at the same time also the observed gas distribution; we therefore suggest further improvements for the models.

Key words: Galaxy: stellar content – Galaxy: evolution – Galaxy: abundances

Send offprint requests to: L. Portinari

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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