Polarimetric observations of the WN7 binary CQ Cephei

Details Polarimetric observations of the WN7 binary CQ Cephei Polarimetric observations of the WN7 binary CQ Cephei

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306..215d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 215-224. Research supported by the Conseil de Recherc

Astronomy and Astrophysics

Astrophysics

36

Eclipsing Binary Stars, Linear Polarization, O Stars, Polarimetry, Stellar Mass, Wolf-Rayet Stars, Electron Scattering, Orbital Elements, Stellar Winds

Scientific paper

Linear polarization variations in the Wolf-Rayet eclipsing binary CQ Cep are reported. These variations describe a double wave with orbital phase, which is consistent with electron scattering in a binary system. The amplitude of the polarization variations in CQ Cep appears to be the largest found among binary stars, excluding the special case of magnetic white dwarfs in close binaries. This may be a consequence of a dense W-R wind in the shortest period binary W-R system known. The orbital inclination derived from the polarimetric data is roughly 78 deg, only slightly different from the value of about 70 deg derived from photometric data. Combining the value of the orbital inclination with the mass function and the mass ratio, masses of 42 and 30 solar masses are found for the WN7 star and the unseen O star companion, respectively.

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