A COMPARISON OF ACCURATE ABSOLUTE PARAMETERS OF ALGOL SYSTEMS WITH RECENT EVOLUTIONARY MODELS

We have compiled a list of nine Algol-type binary stars (Algols) for w hich the observed absolute parameters are based on a self-consistent s olution of both the light curve(s) and radial velocity curves for both components, including the effects of non-Keplerian distortions. The p roperties of these systems are reviewed in the light of recent evoluti onary models. We have been able to estimate initial mass ratios for 5 systems and to show that angular momentum loss via a magnetic stellar wind is an important factor in the evolution of all the systems. We co nclude that there is a lack of suitable evolutionary models for Algols , particularly those of lower mass.