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We have developed a 3-D Monte Carlo radiative transfer model which computesline and continuum polarization variability for a binary system with anoptically thick non-axisymmetric envelope. This allows us to investigate thecomplex (phase-locked) line and continuum polarization variability featuresdisplayed by many massive binaries: W-R+O, O+O, etc. An 8-way tree datastructure constructed via a ``cell-splitting'' method allows for high precisionwith efficient use of computer resources. The model is not restricted to binarysystems; it can easily be adapted to a system with an arbitrary densitydistribution and large density gradients. As an application to a real system,the phase dependent Stokes parameters (I, Q, U) and the phase dependent He I(5876) profiles of the massive binary system V444 Cyg (WN5+O6 III-V) arecomputed.Comment: 11 pages, 14 figures, accepted by Astronomy & Astrophysic

Tree-structured grid model of line and polarization variability from massive binaries