Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7500d&link_type=abstract
HST Proposal ID #7500
Mathematics
Logic
Hst Proposal Id #7500 Stellar Populations
Scientific paper
The Galaxy's dwarf spheroidal {dSph} companions show a surprising diversity in the epoch of their major star formation episode{s}. To aid in understanding the origin of this diversity, we need similar results for the three M31 dSph companions, the nearest set of morphologically similar galaxies. Observations of old main sequence turnoffs in the M31 dSphs are impractical, but with WFPC2 we can establish their HB morphologies, which the observations of galactic dSphs have shown to be a reliable mean age indicator. Cycle 4 observations by this team indicate that the bulk of the star formation in And I took place 10 Gyr ago, though the presence of blue HB and RR Lyrae stars testify to a minor older component. Observations of And II are scheduled for execution in Cycle 6. Here we seek HST time to complete our study of the M31 dSphs by observing And III, the least luminous {M_V -10.2} and most metal-poor {Fe/H -2.0} of the M31 dSph and dE companions. The primary aim is to determine the HB morphology and thus fix the epoch of the major star formation episode in this galaxy. Other results that will follow include an estimate of the true {unprojected} distance from M31 and limits on the fraction of younger stars, since the data will reveal any main sequence stars younger than 2-3 Gyr.
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