6 Conclusions

We have computed line profiles formed in a dusty and expanding spherical atmosphere of the components of a close binary system. We have considered dust scattering optical depth as high as 5 but no absorption due to dust is included. The scattering (isotropic) of dust increases the core emission whether the medium is static or moving. The condition of isotropic scattering should be replaced by Mie scattering phase function for correct estimation of dust scattering. Further, we need to study the formation of lines in the distorted shapes of the components which is under study.