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Title:
Polarization variability among Wolf-Rayet stars. VII - The single stars WR 14, WR 25, and WR 69
Authors:
Drissen, Laurent; Robert, Carmelle; Moffat, Anthony F. J.
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD), AB(Space Telescope Science Institute, Baltimore, MD), AC(Montreal, Universite; Observatoire du Mont Megantic, Montreal, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 10, 1992, p. 288-292. Research supported by NSERC, Ministere de l'Education du Quebec, and Space Telescope Science Institute. (ApJ Homepage)
Publication Date:
02/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL POLARIMETRY, LINEAR POLARIZATION, WOLF-RAYET STARS, POLARIZED RADIATION, STELLAR ENVELOPES, STELLAR MASS EJECTION
DOI:
10.1086/171014
Bibliographic Code:
1992ApJ...386..288D

Abstract

The linear polarization in visible light of three single Wolf-Rayet stars, WR 14 (WC6), WR 25 (WN7), and WR 69 (WC9) has been monitored over an interval of 1 month. As for other early-type WC stars, WR 14 is not significantly variable (at the sigma = 0.03 percent level) during this set of observations; however, its mean polarization level is significantly different from its value in 1987. The two other stars do vary (sigma = 0.06 percent) as expected for late-type W-R stars of either sequence. The high value of P(max)/E(B-V) equal to or greater than 11 for WR 25 suggests an extremely high efficiency of grain alignment in the line of sight to the star. The wavelength dependency of the polarization angle, as well as long-term variability in the U band, suggest some intrinsic polarization component as well for this star.

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