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Spectropolarimetric monitoring of WR140

Published online by Cambridge University Press:  07 August 2017

R.E. Schulte-Ladbeck ,
K. H. Nordsieck ,
K. S. Bjorkman ,
M. R. Meade  and
B. L. Babler
R.E. Schulte-Ladbeck
Affiliation:
Department of Physics and Astronomy, University of Pittsburgh, U.S.A.
K. H. Nordsieck
Affiliation:
Space Astronomy Laboratory, University of Wisconsin, Madison, U.S.A.
K. S. Bjorkman
Affiliation:
Space Astronomy Laboratory, University of Wisconsin, Madison, U.S.A.
M. R. Meade
Affiliation:
Space Astronomy Laboratory, University of Wisconsin, Madison, U.S.A.
B. L. Babler
Affiliation:
Space Astronomy Laboratory, University of Wisconsin, Madison, U.S.A.

Abstract

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We report on eight years of spectropolarimetric monitoring of the WR140 binary. The broad-band linear polarization decreased systematically after the 1985 periastron passage. By 1991, it settled to a constant value at which it has remained through the 1993 periastron passage. We do not detect, in data taken after 1989, a line-effect in He II Λ4686. This suggests either that the continuum and the line emission scatter at the same region, or that any intrinsic polarization has been below our detection limit. We conclude that the presently observed polarization of WR140 is consistent with interstellar foreground polarization.

Keywords

stars: Wolf-Rayetpolarizationindividual: WR140
Type
Session VII - poster summaries
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 506 - 507
Copyright
Copyright © Kluwer 1995 

References

Whitney, B.A. et al. 1988 BAAS 20, 738 Google Scholar
Williams, P.M., van der Hucht, K.A. 1993, WR140 Newsletter Google Scholar