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Title:
Polarization variability among Wolf-Rayet stars. V - Linear polarization of the bright Cygnus stars and an anticorrelation of variability with wind speed
Authors:
Robert, Carmelle; Moffat, Anthony F. J.; Bastien, Pierre; Drissen, Laurent; St.-Louis, Nicole
Affiliation:
AA(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada), AB(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada), AC(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada), AD(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada), AE(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 1034-1054. Research supported by the Space Telescope Science Institute, NSERC, and Ministere de l'Education du Quebec. (ApJ Homepage)
Publication Date:
12/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BINARY STARS, LINEAR POLARIZATION, STELLAR WINDS, WOLF-RAYET STARS, CYGNUS CONSTELLATION, STELLAR MODELS, VARIABLE STARS
DOI:
10.1086/168194
Bibliographic Code:
1989ApJ...347.1034R

Abstract

This paper presents polarimetric data for seven of the eight bright WR stars in Cygnus. Six of the stars show only random, low-amplitude modulation on time scales of hours to days. One of these behaves as expected for a long-period WR + O system with an elliptical orbit. The eighth star is the only short-period WR + O binary in the sample. It is confirmed that the degree of random, intrinsic scatter in polarization is correlated with spectral subclass and terminal wind velocity. It is suggested that this is caused by the presence of propagating blobs which form, survive, and/or grow more easily in slower winds. Two models are proposed to explain the origin of the blobs.

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