T. Kallman

High mass X-ray binaries (HMXBs)are among the brightest and best-studied X-ray sources in the sky.  Therefore they are useful laboratories for the study of accretion, and also likely calibrators for future X-ray observatories.   Since they  are non-circular when projected on the sky, polarization is expected.  Resonance line scattering increases the scattering fraction, often by large factors, over the energy band spanned by resonance lines. Real winds are not expected to be spherically symmetric, or circularly symmetric around the line of centers, owing to the combined effects of the compact object gravity and ionization on the wind hydrodynamics.  In addition, the compact object itself is expected to be intrinsically polarized due to the interaction between emitting electrons and the strong magnetic field.  In this talk I will review the likely observable polarization properties of these sources.