Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5350o&link_type=abstract
HST Proposal ID #5350
Physics
Hst Proposal Id #5350 Cool Stars
Scientific paper
Deep galaxy counts and redshift surveys have uncovered evidence that many dwarf systems may have undergone enhancements in their star formation rates between redshifts of 0.3 to 1.0 (roughly 2-7 Gyr ago). The fossil record of such bursts must exist in the present-day stellar populations of galaxies if this interpretation is correct. We propose HST WF/PC-2 observations of two of the most distant dwarf spheroidal galaxies orbiting the Milky Way -- Leo I and Fornax -- to search for quantitative evidence of such intermediate-age bursts. These galaxies are of particular interest because recent ground-based observations have provided strong circumstantial evidence for the presence of significant intermediate-age populations in both systems. The analysis of our proposed deep V and I band HST WF/PC-2 observations of these galaxies shall involve methods that have been successfully used to determine the star-formation history of field stars in the Large Magellanic Cloud. The capabilities of HST are essential to reach sufficiently faint stars in both galaxies, and to cope with the extremely crowded fields in the cores of the Leo I and Fornax dwarf spheroidal galaxies.
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