Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8137m&link_type=abstract
HST Proposal ID #8137
Other
Hst Proposal Id #8137 Field Stellar Populations
Scientific paper
A major goal of stellar populations studies of galaxies is to reconstruct the star-formation history {SFH} of the Local Universe via observations of the SFHs of individual, nearby galaxies and compare the result with the SFH history derived from high-redshift galaxies. This task is nearly complete in the Local Group {LG}, but the agreement with high redshift observations is poor. Perhaps more local galaxies must be measured to achieve a representative sample. We propose to help enlarge the sample of nearby galaxies with good SFH determinations by obtaining deep V, I WFPC2 observations of UGC 4998 and DDO 44, both early-type dwarf members of the M 81 group that exhibit clear signs of young and intermediate-age populations. These galaxies are complementary to the mostly old, low-surface brightness M81 dwarfs observed to date with HST. Our observations will also allow us to {a} identify radial population gradients as a function of time in both galaxies, {b} determine their ba sic chemical properties, {c} critically compare distances derived using surface-brightness fluctuations in ground-based data, with distances derived from the HST data using the tip of the red giant branch, {d} place the galaxies in the global relations for other early-type systems that relate metallicity, size, surface brightness and luminosity, and {e} in UGC 4998, compare the stellar populations of its nucleus and off-center globular cluster.
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