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

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

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454l..27w&link_type=abstract

Astrophysical Journal Letters v.454, p.L27

Astronomy and Astrophysics

Astronomy

17

Galaxies: Magellanic Clouds, Stars: Abundances, Stars: Early-Type, Stars: Mass Loss, Ultraviolet: Stars

Scientific paper

The first survey of the far-UV (900--1200 A) spectra of O stars in the Magellanic Clouds, observed with the Hopkins Ultraviolet Telescope during the Astro-2 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 systematic spectral-type dependence of the numerous stellar-wind features in this relatively little-studied wavelength range, including those of O VI and S VI, is illustrated and described. One of the LMC O3 stars, with EB-V = 0.25, displays strong interstellar H2 features.

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