  In this paper we present some results concerning the study of the development
of galactic winds in blue compact galaxies. In particular, we model a situation
very similar to that of the galaxy IZw18, the most metal poor and unevolved
galaxy known locally. To do that we compute the chemo-dynamical evolution of a
galaxy in the case of one istantaneous isolated starburst as well as in the
case of two successive instantaneous starbursts. We show that in both cases a
metal enriched wind develops and that the metals produced by the type Ia SNe
are lost more efficiently than those produced by type II SNe. We also find that
one single burst is able to enrich chemically the surrounding region in few
Myr. Both these results are the effect of the assumed efficiency of energy
transfer from SNe to ISM and to the consideration of type Ia SNe in this kind
of problem. The comparison with observed abundances of IZw18 suggests that this
galaxy is likely to have suffered two bursts in its life, with the previous
being less intense than the last one.

Astrophysics