Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5384w&link_type=abstract
HST Proposal ID #5384
Computer Science
Hst Proposal Id #5384 Hot Stars Clusters
Scientific paper
We propose to evaluate the degree to which metal abundance affects stellar population at the high-mass end. We will target the galaxy M33, whose proximity and large sample of HII regions of differing metallicity make it ideally suited for such a study. Rather than relying on COMPOSITE spectral indices of stellar population, we will exploit the superior acuity of the HST to RESOLVE the individual stars that underly and power 6 of the brightest HII regions in M33. Through multi-band imaging with the WFPC2 camera and subsequent photometry, we will be able to differentiate among the upper main-sequence, giant, supergiant, and Wolf-Rayet stars. Once we resolve and decompose the ionizing clusters, we will then be able to provide a critical evaluation of the relationship between metallicity and stellar population. Moreover, by comparing the resolved stellar populations in M33's giant HII regions with their composite colors and emission-line properties, we will be able to provide an essential foundation for interpreting the composite spectral indices of starburst regions in more distant galaxies.
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