Wolf-Rayet stars. VII - Optical spectropolarimetry of WC9 stars

Details Wolf-Rayet stars. VII - Optical spectropolarimetry of WC9 stars Wolf-Rayet stars. VII - Optical spectropolarimetry of WC9 stars

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.180...37c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 180, July 1977, p. 37-44.

Astronomy and Astrophysics

Astronomy

25

Hot Stars, Optical Polarization, Polarimetry, Stellar Magnitude, Stellar Spectra, Stellar Spectrophotometry, Wolf-Rayet Stars, Cosmic Dust, Electron Scattering, Infrared Radiation, Interstellar Extinction, Line Spectra, Rayleigh Scattering, Stellar Envelopes

Scientific paper

Results are reported for spectrophotometry and spectropolarimetry, over the wavelength range from 4270 to 6700 A, of the extreme WC9 star Ve 2-45 and two more typical members of the class, AS 320 and MR 82 (HDE 313643). The line-to-continuum ratios of all three stars indicate excess continuum fluxes, which are attributed to hot binary companions. No evidence is found for circumstellar extinction around either AS 320 or MR 82, but it is suggested that the dust envelope of Ve 2-45 must produce some 4.7 magnitudes of extinction. The observed stellar magnitudes at 5160 A are tabulated along with the intrinsic V magnitudes and absolute magnitudes of the WC and companion stars, the distances, and the likely spectral types of the companions. Two distinct polarization components are observed for each star: wavelength-independent polarization attributed to Thomson scattering in the envelopes and increasing polarization in the blue region consistent with Rayleigh scattering by either molecules or very small solid particles.

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