This notion finds its support in results of modelling winds from the red giants. Arndt et al. This becomes important in the case of a binary system, where the mass losing star can be noticeably distorted by tidal forces. Differences in the local conditions over the stellar surface may then lead to different local intensities of the outflow. Thus the wind will show an intrinsic directivity and may be globally enhanced.
Next section presents details of our approach.
Results of numerical modelling of the wind structure are given and discussed in Sect. An analytical approximation, which helps to understand and interpret the results, is developed in Sect. General discussion and summary are given in Sect.