Certain Aspects of the Problem of Mass Transfer in Semi-Detached Binaries

Non-LTE effects in streams, and mass-transfer rates in three eclipsing binaries

“…That is, data are adequate to place fairly conservative limits on possible scale heights. The upper limit is not inconsistent with Budding's (1981) suggestion that turbulence may occur in streams, presumably increasing their scale heights somewhat. It is nearly impossible to verify the form of the pressure variation with height and to confirm that it does, in fact, correspond to hydrostatic equilibrium.…”

“…Photometric observations provide estimates of stellar temperatures, and light-curve solutions fix the fractional radii of the stars. Stream paths, which may be deflected as Budding (1981) warned, and the geometry at the selected phases near 0.9 and 0.1, determine solid angles iij and fl 2 . Calculated light losses are not very sensitive to any of these parameters, so rough estimates suffice.…”

“…More recently Budding (1981) expanded on the LS treatment by considering nonconservative effects arising from turbulence in the stream and, particularly, repulsion by radiation pressure and/or stellar winds from gainers hotter than about type A0. He suggested that a cutoff in Roche lobe overflow may be expected for gainers hotter than about B5.…”