  We explore one of plausible causes of asymmetry in the wind of an AGB star -
the presence of a binary companion. We have developed a simple method for
estimating the intrinsic non-sphericity of the outflow in that case. Assuming
the Roche model, local stellar parameters (T_eff, g) are calculated, and then a
formula for the local mass loss rate is applied. As a by-product a relation
between the ratio of stellar radius to the Roche lobe radius and the overall
wind enhancement is obtained.
