Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6530l&link_type=abstract
HST Proposal ID #6530
Other
Hst Proposal Id #6530 Hot Stars
Scientific paper
The wind momentum-luminosity relationship (WLR) for supergiantstars provides the means to determine the distances of theseobjects in other galaxies more accurately than traditionalmethods. The late B- and early A-type supergiants areparticulary important since these stars are the brightest atvisual wavelengths where the critical wind diagnostic feature,the HAlpha line, is observed. However, as has beendemonstrated using O-stars in the Magellanic Clouds, the WLRis dependent on metallicity. In order to calibrate this methodwe have undertaken a systematic investigation of these objectsin our galaxy and in the Magellanic Clouds. However, incontrast to the O-stars, the dynamics of the winds of late B-and early A-type supergiants as a function of metallicity arepoorly understood. This information, in particular thevelocity fields and terminal velocities, is most reliablyderived for these stars from the shifts of wind lines in theultra-violet; the required spectra for galactic objects isforthcoming from IUE observations while observations for starsin the SMC will be carried out with HST during Cycle 5. Herewe propose observing a sample of late B- and early A-typesupergiants in the LMC, to extend our sample to metallicitiesintermediate between the SMC and the Milky Way. Thiscalibration is essential if we are to extend this method tosupergiants in even more distant resolved galaxies beyond theLocal Group using very large ground-based telescopes (Keck,VLT, HET).
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