HUBBLE-SPACE-TELESCOPE SPECTROSCOPY OF MASSIVE HOT STARS IN THE MAGELLANIC CLOUDS AND M31

Using the Hubble Space Telescope (HST) and the Faint Object Spectrogra ph (FOS) high signal to noise spectrograms were obtained for 15 OB sta rs in the Magellanic Clouds, three of which are of spectral type O3. T he data cover the spectral region from 1150 A - 2300 A with a resoluti on of DELTAlambda/lambda almost-equal-to 1 A. One O8.5 supergiant, OB7 8#231, in M31 is also included in this work. These data are a substant ial improvement on previous high resolution IUE observations in the Ma gellanic Clouds (Walborn et al. 1985 and references therein) because o f the smaller aperture and the much better signal to noise ratio, whil e no high resolution UV spectra of O stars in M31 have been obtained b efore. In this paper we discuss various morphological aspects of the s pectra, concerning metallicity and the stellar winds, compared to gala ctic analogues.