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Title:
Polarization variability among Wolf-Rayet stars. VI - Linear polarimetry of the eclipsing binary V444 Cygni
Authors:
Robert, Carmelle; Moffat, Anthony F. J.; Bastien, Pierre; St.-Louis, Nicole; Drissen, Laurent
Affiliation:
AA(Montreal, Universite, Montreal, Canada), AB(Montreal, Universite, Montreal, Canada), AC(Montreal, Universite, Montreal, Canada), AD(Montreal, Universite, Montreal, Canada), AE(Montreal, Universite, Montreal, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 211-218. Research supported by the Space Telescope Science Institute, NSERC, and Formation de Chercheurs et l'Aide a la Recherche of Quebec. (ApJ Homepage)
Publication Date:
08/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ECLIPSING BINARY STARS, LINEAR POLARIZATION, POLARIZATION (WAVES), WOLF-RAYET STARS, CYGNUS CONSTELLATION, ELECTRON SCATTERING, LIGHT CURVE
DOI:
10.1086/169051
Bibliographic Code:
1990ApJ...359..211R

Abstract

Precision broad-band blue light monitoring in linear polarization of the bright Cygnus W-R + O system V444 Cyg is reported. Analysis of the data yields an orbital inclination i = 78.5 deg, in good agreement with previous estimates based on polarimetry and on the analysis of light curves. In addition, V444 Cyg shows rapid polarimetric modulation around phase 0.5, when the O star companion eclipses the scattering electrons located primarily in the dense inner W-R wind. Simple modeling of the polarization eclipse based on a spherical electron envelope around the W-R star yields a satisfactory fit to the data. This model also supports the small value of the W-R core radius previously proposed by other authors.

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