Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5998m&link_type=abstract
HST Proposal ID #5998
Computer Science
Hst Proposal Id #5998 Stellar Populations
Scientific paper
We are proposing to use OB associations in M31, M33, and NGC 6822 to determine how stellar evolution proceeds for high mass stars. What mass range turns into Wolf-Rayet stars rather than red supergiants? What is the evolutionary link between WN and WC stars? How are answers to these questions affected by metallicity? Over the past decade we have completed surveys of Wolf-Rayet stars in selected OB associations of these three galaxies. We also have data for determining the red supergiant content of these same regions. Although we have obtained UBV CCD data under subarcsecond conditions, and have extensive optical spectroscopy for the bluest stars, our interpretation of our HRDs is stymied by our inability to distinguish three crowded 40Mo of similar effective temperature from a single 90Mo star. We need the 10* improvement in resolving power (compared to our best ground-based efforts) offered by the refurbished HST.
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