Driven-disk model for binaries with a precessing donor star: Three-dimensional simulations

We present the results of three-dimensional simulations of mass transfer in a semi-detached binary with a donor star whose intrinsic rotation vector p recesses around the orbital rotation axis of the binary in the observer's c oordinate frame. The calculations support our previous model of flow withou t a hot spot. Characteristic features of the flow in this model, such as th e formation of an intercomponent envelope, absence of a hot spot at the edg e of the accretion disk, and the formation of a shock wave along the edge o f the stream, are also present in the solution for a binary with a precessi ng donor star. The simulations support models with a driven accretion disk. The parameters of the accretion disk and of the structure of the circum-di sk area recur with the precessional period of the rotation axis of the dono r star.