Binary stars interact in a variety of ways depending on...
-  Winds
- Colliding winds in early-type stars, wind accretion in high-mass XRBs,...
-  Luminosity
- Surface heating by a companion X-ray source, photoionization of the wind in
symbiotic stars, ...
-  Magnetic Fields
- The strong stellar magnetic field in AM Her stars...
-  Binary Separation
- Tidal effects in close binaries: large tides, distorted winds, synchronization, 
mass transfer,...
