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A Reconnaissance of the 900--1200 A Spectra of Early O Stars in the Magellanic Clouds

Summary: A Reconnaissance of the 900--1200 š A Spectra of
Early O Stars in the Magellanic Clouds
Nolan R. Walborn and Knox S. Long
Space Telescope Science Institute, 1 3700 San Martin Drive, Baltimore, MD 21218
Daniel J. Lennon and Rolf­Peter Kudritzki
Institute for Astronomy and Astrophysics, Munich University, Scheinerstrasse 1, D­81679
Munich, Germany
Received ; accepted
1 Operated by the Association of Universities for Research in Astronomy, Inc., under
contract with the National Aeronautics and Space Administration.

-- 2 --
The first survey of the far­UV (900--1200 š A) spectra of O stars in the
Magellanic Clouds, observed with the Hopkins Ultraviolet Telescope during
the Astro­2 mission, is presented. Five objects in each Cloud were obtained,
including four of type O3 (one of which is the current candidate for the most
massive star known) and a pair of O4 If supergiants with remarkably different
relative CNO strengths. All of the SMC objects are in its largest H II region,
NGC 346, and show strong effects of the systemic metal deficiency. The


Source: Henry, Richard C.- Department of Physics and Astronomy, Johns Hopkins University


Collections: Physics