Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7481k&link_type=abstract
HST Proposal ID #7481
Computer Science
Hst Proposal Id #7481 Hot Stars And Stellar Corpses
Scientific paper
We propose to acquire STIS low-resolution UV spectra of early B-supergiants in M31 and M33 to determine the terminal velocities of their stellar winds. The velocities are crucial to derive distances to the hot stars using the Wind-momentum Luminosity Relationship {WLR}, in conjunction with existing moderate- and high-resolution spectra from 4m class telescopes and the Keck-I telescope respectively, and WFPC2 multi-colour photometry to be obtained soon during Cycle 6. The radiation- driven stellar wind momenta and the metallicities determined from our optical and UV-spectra translate via the WLR into intrinsic luminosities. The HST photometry provides accurate de-reddened apparent magnitudes within the crowded field of the M31 and M33 spiral arms and then - together with the intrinsic luminosities - distances. The resulting WLR distances to M31 and M33 will be compared to the distances from Cepheids {where metallicity and extinction influences are less tractable}, as a basis for extending the WLR method beyond the Local Group out to the Virgo cluster of galaxies.
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