A RECONNAISSANCE OF THE 900-1200 ANGSTROM SPECTRA OF EARLY O-STARS INTHE MAGELLANIC-CLOUDS

The first survey of the far-UV (900-1200 Angstrom) spectra of O stars in the Magellanic Clouds, observed with the Hopkins Ultraviolet Telesc ope during the Astro-2 mission, is presented. Five objects in each Clo ud were obtained, including four of type O3 (one of which is the curre nt candidate for the most massive star known) and a pair of O4 If supe rgiants with remarkably different relative CNO strengths. All of the S MC objects are in its largest H II region, NGC 346, and show strong ef fects of the systemic metal deficiency. The systematic spectral-type d ependence of the numerous stellar-wind features in this relatively lit tle-studied wavelength range, including those of O VI and S VI, is ill ustrated and described. One of the LMC O3 stars, with E(B-V) = 0.25, d isplays strong interstellar H-2 features.