Variable Stars in 'Nearby' Galaxies with HST

摘要

Results are presented on the study of the variable star population in a number of extragalactic stellar systems that range from the globular clusters (GCs) of the Small Magellanic Cloud (SMC), the Fornax dwarf spheroidal (dSph) and the Andromeda spiral galaxy, to one of the most remote and metal poor systems resolved in stars: the blue compact dwarf galaxy IZw 18. All these studies are largely based on proprietary observations with the Wide Field Planetary Camera 2 (WFPC2) and the Advanced Camera for Surveys (ACS) on board to the Hubble Space Telescope (HST) and on HST archival data.