Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7749l&link_type=abstract
HST Proposal ID #7749
Other
Hst Proposal Id #7749 Hot Stars And Stellar Corpses
Scientific paper
The wind momentum-luminosity relationship {WLR} for supergiant stars provides the means to determine the distances of these objects in other galaxies more accurately than traditional methods. The late B- and early A-type supergiants are particulary important since these stars are the brightest at visual wavelengths where the critical wind diagnostic feature, the HAlpha line, is observed. However, as has been demonstrated using O-stars in the Magellanic Clouds, the WLR is dependent on metallicity. In order to calibrate this method we have undertaken a systematic investigation of these objects in our galaxy and in the Magellanic Clouds. However, in contrast to the O-stars, the dynamics of the winds of late B- and early A-type supergiants as a function of metallicity are poorly understood. This information, in particular the velocity fields and terminal velocities, is most reliably derived for these stars from the shifts of wind lines in the ultra-violet; the required spectra for galactic objects is forthcoming from IUE observations while observations for stars in the SMC will be carried out with HST during Cycle 5. In Cycle 6 we observed a sample of late B- and early A-type supergiants in the LMC, however this program {6530} was incomplete and we have two carry-over orbits for Cycle 7 {this program} to observe one additional A-type supergiant.
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