Close binary systems before and after mass transfer. II.Semi-detached systems

Recent data on semi-detached systems are compared with general results of close binary computations to determine the origin of Algol-type systems (classical case A and case B results are considered). Both the conservative and the non-conservative mode of mass exchange are investigated. It is found that the assumption of considerable mass loss from the system gives satisfying agreement with the observations. It is also concluded that the calculation of an extensive homogeneous network of case A computations is needed.This research is supported by the National Foundation of Collective Fundamental Research of Belgium (FKFO) under No. 2.9009.79.