About the Interpretation of Gaseous Streams in Close Binary Systems

Abstract

It is rather generally accepted that gaseous streams in close binary systems are caused by transfer of matter from the less massive component, which fills its lobe of the inner contact surface, to the more massive one, via the first Lagrangian point. This model is satisfactory theoretically but leaves many observational peculiarities unexplained. It is generally believed that the process is amply supported by observational evidence, but a closer inspection shows this not to be the case and a more careful discussion of the available data leads to a different picture. As an example a rediscussion is given of Struve’s observations of SX Cas, resulting in the conclusion that not one (as Struve believed) but two streams of gas are approaching the surface of the primary component, at roughly opposite sides. The origin of these streams is ascribed to the tidal bulges, which conclusion can be confirmed by observations of many other close binary systems.

This would mean that, if the stream through L₁ really exists, it cannot be observed. It is even possible that it does not exist at all, if supposedly a flat disk around the primary is extending toward the inner contact surface, sealing off the first Lagrangian point. There are observational indications of the existence of such a disk.

A qualitative explanation of these phenomena will be given in a forthcoming publication.