Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7496s&link_type=abstract
HST Proposal ID #7496
Physics
Hst Proposal Id #7496 Stellar Populations
Scientific paper
Recent results from the ground and from HST for different types of dwarf galaxies show that even in these apparently simple stellar systems, a variety of different star formation histories can be found. The star formation rate can be observed to either take place continuously or in several discrete episodes spanning several Gyr. The reasons for these variations are not yet well understood, and they are fundamental to our understanding of galaxy formation and evolution. Currently, detailed SFHs are available only for Milky Way satellites; a biased sample. To determine SFHs for more distant galaxies with a wider range of properties and environments, CMDs at deep limits are required. We propose a careful study of two of the closest isolated dIs: IC 1613 {660 kpc} and Sextans A {1400 kpc}. In this way we can probe IC 1613 down to limits close to the oldest turnoffs {M_V +3.5}, and the very metal poor system, Sextans A, down to slightly younger limits {M_V +2}. Because of the effects of crowding on ground based observations, this can only be achieved with the HST. One of our main goals will to test the hypothesis that these two galaxies could have been part of the ``faint blue galaxy'' population seen at higher redshifts.
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