THE STAR-FORMATION HISTORY OF GR8 WITH HST IMAGERY

We report the results of a deep imaging study of the nearby irregular galaxy GR8 using the Wide-Field Camera on the Hubble Space Telescope. These data enable us to perform photometry on stars as faint as R approximately 24.5 with spatial resolution superior to ground-based observations. Color-magnitude diagrams in the ''BVR'' filters are presented and compared with cluster isochrones and evolutionary tracks for massive stars of very low metallicity. We conclude that the star formation history of GR8 during the past 10(9) years resembles a ''wave'' progressing from the NE to the SW parts of the galaxy, as opposed to a single starburst event.