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Radio light-curves and circumstellar mapping of the colliding wind binary WR140

Published online by Cambridge University Press:  07 August 2017

P.M. Williams ,
K.A. van der Hucht ,
T.A.Th. Spoelstra  and
J.P. Swaanenvelt
P.M. Williams
Affiliation:
1 Royal Observatories, Edinburgh, Scotland, U.K.
K.A. van der Hucht
Affiliation:
2 Space Research Organization Netherlands, Utrecht, The Netherlands
T.A.Th. Spoelstra
Affiliation:
3 Netherlands Foundation for Research in Astronomy, Dwingeloo, The Netherlands
J.P. Swaanenvelt
Affiliation:
2 Space Research Organization Netherlands, Utrecht, The Netherlands

Abstract

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New observations of the colliding wind Wolf-Rayet WC7+O4-5 binary WR140 (HD 193793) at 6 cm and 21 cm with the Westerbork Synthesis Radio Telescope are presented. They show that the 21 cm flux, in particular, rose to a sharp maximum in 1992, lagging about a year behind the 6 cm flux. After maximum, both fell simultaneously. The data are interpreted in terms of the varying circumstellar extinction to a non-thermal source in the wind interaction region due to the winds of both WC and O stars.

Keywords

stars: Wolf-Rayetbinariesradio emissionindividual: WR140
Type
Session VII - poster summaries
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 504 - 505
Copyright
Copyright © Kluwer 1995 

References

Williams, P.M., van der Hucht, K.A., Pollock, A.M.T., Florkowski, D.R., van der Woerd, H., Wamsteker, W.M. 1990, MNRAS 243, 662 (W90) Google Scholar
Williams, P.M., van der Hucht, K.A., Spoelstra, T.A.Th. 1994, A&A in press Google Scholar