Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8604t&link_type=abstract
HST Proposal ID #8604
Other
Hst Proposal Id #8604 Stellar Populations
Scientific paper
The Small Magellanic Cloud {SMC} is an extraordinary galaxy. It is the nearest example of a low metallicity, star-forming dwarf irregular, contains a wide range of stellar ages, and is distorted by interactions with the Milky Way and its close companion, the Large Magellanic Cloud. We propose to investigate the structure and evolutionary history of the SMC by obtaining a series of 50 three-color SNAPshots with WFPC2 of selected SMC regions. With this polling of SMC field star properties, we will produce color-magnitude diagrams {CMDs} in the U, V and I bands which will reach V 23.5 in regions too crowded to be observed accurately from the ground. We will use these data for investigations of two major topics: {1} the star formation history of the SMC, by quantitative matching between models and data using a sophisticated numerical approach which properly accounts for errors and other uncertainties. {2} the structure of the SMC along our line of sight. The galaxy is thought to be considerably distended in this direction and we will put constraints on this from the width of the observed lower main sequence. In addition, by obtaining accurate photometry for about 100, 000 stars in each region, our CMDs will provide an excellent basis for comparisons with evolutionary tracks of low metal stars in the few solar masses range.
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