Far ultraviolet spectroscopic explorer observations of the stellar winds of two O7 supergiants in the magellanic clouds

A. W. Fullerton*, P. A. Crowther, O. De Marco, J. B. Hutchings, L. Bianchi, K. R. Brownsberger, D. L. Massa, D. C. Morton, B. L. Rachford, T. P. Snow, G. Sonneborn, J. Tumlinson, A. J. Willis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We compare the stellar wind features in far-UV spectra of Sk -67°111, an O7 Ib(f) star in the LMC, with Sk 80, an O7 Iaf+ star in the SMC. The most striking differences are that Sk 80 has a substantially lower terminal velocity, much weaker O VI absorption, and stronger S IV emission. We have used line-blanketed, hydrodynamic, non-LTE atmospheric models to explore the origin of these differences. The far-UV spectra require systematically lower stellar temperatures than previous determinations for O7 supergiants derived from plane-parallel, hydrostatic models of photospheric line profiles. At these temperatures, the O VI in Sk -67°111 must be due primarily to shocks in the wind.

Original languageEnglish
Pages (from-to)L43–L46
Number of pages4
JournalAstrophysical Journal
Volume538
Issue number1
Publication statusPublished - 20 Jul 2000
Externally publishedYes

Keywords

  • Stars: early-type
  • Stars: individual (Sk -67°111, Sk 80)
  • Stars: winds, outflows

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