| Abstract
| - We have developed a 3-D Monte Carlo radiative transfer model which computes line and continuum polarization variability for a binary system with an optically thick non-axisymmetric envelope. This allows us to investigate the complex (phase-locked) line and continuum polarization variability features displayed by many massive binaries: W-R+O, O+O, etc. An 8-way tree data structure constructed via a "cell-splitting" method allows for high precision with efficient use of computer resources. The model is not restricted to binary systems; it can easily be adapted to a system with an arbitrary density distribution and large density gradients. As an application to a real system, the phase dependent Stokes parameters \( \left( I, Q, U\right) \) and the phase dependent He i ( \( \lambda \)5876) profiles of the massive binary system V444 Cyg (WN5+O6 III-V) are computed.
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