| Summary: | ABSTRACT. Analysis of the polarimetric measurements of the eclipsing binary system V448 Cyg in wide UBVRI niters has shown the presence of the following components of the polarization: a) interstellar; b) constant intrinsic polarization with a flat spectrum; c) phase-dependent contribution, the amplitude of which decreases with wavelength. Constant component is possibly caused by an extended disk-like optically thin refracting envelope; the variable one may be caused by relatively dense condensations near the Lagrangian points in a binary. By analyzing the Fourier harmonics, the inclination angle is found to be i = 82°. The orbital plane of the system is inclined in respect to the Galaxy plane at an angle 70°. Mass of the extended envelope is estimated to be 1.5 x 10-8 M☉ with a mass loss rate 8.6 x 10-7 M☉/yr. Key words: Stars: binaries: close, eclipsing; circumstellar matter; polarization.
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