STAR-FORMATION HISTORY OF THE POST STARBURST GALAXY NGC-1569

We discuss the star formation history in the post-starburst galaxy NGC 1569 using colour-magnitude diagrams derived from HST WPFC images in the F555W and F785LP filters. This galaxy has experienced a global bur st of star formation from 1 x 10(8) yr to about 4 Myr ago. Evidence ha s been found of older episodes of star formation from 1.5 Gyr to 1.5 x 10(8) yr ago, which rules out long quiescent phases in this galaxy. S imple calculations of the stellar energy input into the supergiant she lls found in NGC 1569 suggest that the hot gas inside these structures will probably blow out of the galaxy.