Simultaneous five-colour (UBVRI) polarimetry of EF ERI

Details Simultaneous five-colour (UBVRI) polarimetry of EF ERI Simultaneous five-colour (UBVRI) polarimetry of EF ERI

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..120p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 120-128.

Astronomy and Astrophysics

Astrophysics

33

Cataclysmic Variables, Polarimetry, Stellar Spectrophotometry, Ubv Spectra, X Ray Binaries, Circular Polarization, Linear Polarization, Stellar Magnetic Fields, Stellar Models, Stellar Rotation

Scientific paper

The authors' simultaneous multicolor observations have revealed new features in the wavelength and orbital phase dependence of the linear and circular polarization of EF Eri. These have been interpreted in terms of cyclotron emission from two discrete regions at largely differing (≡80°) latitudes but having the same magnetic field polarity. This implies a near-equatorial emission region deviating from the dipole field geometry. The strong (30° - 35°) rotation of position angle as a function of wavelength from U to I could be explained by Faraday rotation. Magnetic field estimates from the ratio of linear to circular polarization give stronger fields for the shorter wavelengths than those found in the red and infrared.

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