Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8207b&link_type=abstract
HST Proposal ID #8207
Other
Hst Proposal Id #8207 Hot Stars
Scientific paper
We propose to obtain STIS Ultraviolet spectra of seven Ofpe/WN9 stars {``slash stars''} in M 33 discovered from ground-based {KPNO, MMT} classification spectra of the 400 UV- brightest stellar sources measured in the Ultraviolet Imaging Telescope images {Massey, Bianchi, Hutchings & Stecher 1996}. The purpose is to derive stellar parameters {T_eff, Luminosity, Radius, Mass, element abundances, mass-loss rate, and wind velocity} by modeling wind and photospheric line profiles. The measured stellar quantities will be compared {a} with our previous HST observations of O supergiants and WNL stars in M33, and {b} with archive spectra of Ofpe/WN9 stars in the Galaxy and the LMC. The program will provide constraints on the evolutionary scenarios for Ofpe/WN9 interpretations, clarify on the formation of Wolf-Rayet stars, and will extend our comparison of massive populations in Local Group galaxies to another, important class of objects. WFPC2 imaging parallel to the primary spectroscopy in UBV and FUV filters will allow to substantially extend our study of the hot massive star population and populous stellar clusters in this galaxy.
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