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FUSE 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
; | | Date: |
2 May 2000 | | Journal: | ApJ, 538, L43 [2000] | | Subject: | astro-ph | | Affiliation: | UVic/JHU), P. A. Crowther, O. De Marco (UCL), J. B. Hutchings (HIA/NRC), L. Bianchi (JHU), K. R. Brownsberger (U. Colorado), D. L. Massa (Raytheon ITSS), D. C. Morton (HIA/NRC), B. L. Rachford, T. P. Snow (U. Colorado), G. Sonneborn (NASA/GSFC), J. Tum | | 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. | | Source: | arXiv, astro-ph/0005039 | | Services: | Forum | Review | PDF | Favorites | |
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