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

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 journal › Article › peer-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 language	English
Pages (from-to)	L43–L46
Number of pages	4
Journal	Astrophysical Journal
Volume	538
Issue number	1
Publication status	Published - 20 Jul 2000
Externally published	Yes

Keywords

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

Cite this

Fullerton, A. W., Crowther, P. A., De Marco, O., Hutchings, J. B., Bianchi, L., Brownsberger, K. R., Massa, D. L., Morton, D. C., Rachford, B. L., Snow, T. P., Sonneborn, G., Tumlinson, J., & Willis, A. J. (2000). Far ultraviolet spectroscopic explorer observations of the stellar winds of two O7 supergiants in the magellanic clouds. Astrophysical Journal, 538(1), L43–L46.

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title = "Far ultraviolet spectroscopic explorer observations of the stellar winds of two O7 supergiants in the magellanic clouds",

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.",

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

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

year = "2000",

month = jul,

day = "20",

language = "English",

volume = "538",

pages = "L43–L46",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Far ultraviolet spectroscopic explorer observations of the stellar winds of two O7 supergiants in the magellanic clouds

AU - Fullerton, A. W.

AU - Crowther, P. A.

AU - De Marco, O.

AU - Hutchings, J. B.

AU - Bianchi, L.

AU - Brownsberger, K. R.

AU - Massa, D. L.

AU - Morton, D. C.

AU - Rachford, B. L.

AU - Snow, T. P.

AU - Sonneborn, G.

AU - Tumlinson, J.

AU - Willis, A. J.

PY - 2000/7/20

Y1 - 2000/7/20

N2 - 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.

AB - 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.

KW - Stars: early-type

KW - Stars: individual (Sk -67°111, Sk 80)

KW - Stars: winds, outflows

UR - http://www.scopus.com/inward/record.url?scp=0034691343&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0034691343

SN - 0004-637X

VL - 538

SP - L43–L46

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

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

Abstract

Keywords

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