Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3810c&link_type=abstract
HST Proposal ID #3810
Other
Hst Proposal Id #3810
Scientific paper
We propose to observe a comprehensive sample of Wolf-Rayet (W-R) galaxies --- starburst galaxies in which broad 4686 He II emission of stellar origin has been detected. These galaxies generally contain far more W-R stars than the Milky Way, M31, and other normal galaxies. The ultraviolet FOC images and FOS spectra will be combined with optical and infrared data as part of a large effort to perform a broad, systematic analysis of the properties of W-R galaxies. The UV data obtained with HST will provide crucial constraints on the hot star (O and W-R) populations, and will lead to a better understanding of the physical conditions, initial mass functions, and starburst parameters of these galaxies. The overall continuum will be analyzed within the framework of evolutionary and spectral synthesis models that we are developing. Quantitative spectroscopy of UV resonance lines will allow us to study the hot star populations in detail, and to directly measure the number of OB stars within these galaxies. Our main goal is to determine which physical properties of W-R galaxies (e.g., IMF slope, chemical composition, age, strength and duration of the starburst) have led to the production of large numbers of W-R stars. The results of this study will have important implications for our understanding of W-R galaxies, and also of starburst and emission-line galaxies in general.
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