Star formation histories of late-type dwarfs outside the Local Group

Abstract

We describe the star formation histories of three late-type dwarfs located outside the Local Group: IZw18, NGC1569 and NGC1705. The results are based on the application of the method of synthetic colour-magnitude diagrams to deep HST photometric data. All the examined galaxies were already forming stars at the reached lookback time and show no evidence of long quiescent phases. The obtained scenarios are quite similar to those derived for other galaxies of this morphological type, both inside and outside the Local Group.