Polarization variability among Wolf-Rayet stars. I. Linear polarization of a complete sample of southern Galactic WC stars

Details Polarization variability among Wolf-Rayet stars. I. Linear polarization of a complete sample of southern Galactic WC stars Polarization variability among Wolf-Rayet stars. I. Linear polarization of a complete sample of southern Galactic WC stars

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..870s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 870-887. Research supported by the Space Telescope S

Astronomy and Astrophysics

Astrophysics

87

Binary Stars, Linear Polarization, Southern Sky, Stellar Winds, Wolf-Rayet Stars, Companion Stars, Supergiant Stars, Tables (Data), Time Dependence

Scientific paper

As the first in a series of investigations on polarization variability of Wolf-Rayet (W-R) stars, this paper presents extensive time-dependent linear polarization observations of the seven known southern W-R stars of the carbon sequence brighter than magnitude b = 9. The results can be grouped into three categories: (1) three single-line stars, for which the observed stochastic variability in polarization decreases dramatically for stars with faster winds; the additional fact that the polarization vector of the nonvarying WC 7 star HD 156385 matches the interstellar polarization vector suggests that its wind is highly homogeneous, spherically symmetric, and very stable in time; (2) two short-period WC + O V binaries which show double-wave orbital modulation with very low residuals as expected from (1) for fast winds; and (3) two relatively long-period WC + O I binaries in which the effects of nonradial pulsations of the bright supergiants are important compared to the binary modulation.

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