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IUE monitoring of WR140 (WC7+O4-5)

Published online by Cambridge University Press:  07 August 2017

D.Y.A. Setia Gunawan ,
K.A. van der Hucht ,
P.M. Williams ,
L. Kaper ,
H. Henrichs  and
W. Wamsteker
D.Y.A. Setia Gunawan
Affiliation:
1 Space Research Organization Netherlands, Utrecht, The Netherlands
K.A. van der Hucht
Affiliation:
1 Space Research Organization Netherlands, Utrecht, The Netherlands
P.M. Williams
Affiliation:
2 Royal Observatories, Edinburgh, U.K.
L. Kaper
Affiliation:
3 University of Amsterdam, The Netherlands
H. Henrichs
Affiliation:
3 University of Amsterdam, The Netherlands
W. Wamsteker
Affiliation:
4 ESA IUE Observatory, Madrid, Spain

Abstract

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We present the first results of the IUE monitoring campaign of the WC7+O4-5 binary system WR140. Thirty-four high-resolution short-wavelength spectra were obtained in 1979—93, i.e., over more than one orbital period of 7.9 yr. The spectra show variations in the strong resonance lines of CIV and SiIV: large variations occur at the blue edges of the absorption parts of their P-Cygni profiles just after periastron passage. The observed profile changes are discussed in terms of a velocity variation at periastron passage and/or turbulence in the sightline to the O4—5 star at this time.

Keywords

stars: Wolf-Rayetbinariesultraviolet spectroscopyindividual: WR140
Type
Session VII - Hydrodynamics and high-energy physics of colliding winds
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 466 - 470
Copyright
Copyright © Kluwer 1995 

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