Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7506t&link_type=abstract
HST Proposal ID #7506
Other
Hst Proposal Id #7506 Stellar Populations
Scientific paper
We propose to perform a case study of the star formation history and chemical evolution of NGC1705, an irregular galaxy with distance modulus 28, whose stellar content cannot be resolved from ground. For this galaxy there is direct observational evidence for the presence of a galactic wind, a phenomenon predicted by most chemical evolution models for this type of galaxy. Its star formation history will be derived by using two complementary methods: the comparison of CMD's based on WFPC2 images, with theoretical simulations for those regions of the galaxy resolved into stars, and the analysis of the UV spectra of the stellar supercluster with corresponding theoretical models. These spectra have already been taken with GHRS and are available from the archive. The derived star formation rate and IMF will be used to compute: {i} the energy input into the ISM, to be compared with the energetics of the superwinds; {ii} the chemical enrichment of the galaxy; and {iii} the mass in heavy elements lost from the galaxy. The status of NGC 1705 will be compared to the similar system NGC 1569, currently being investigated by us, and to other nearby irregulars.
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