Article

Astrophysics and Space Science

, Volume 21, Issue 2, pp 289-305

Photometric effects of gas streams in Algol systems and their influence on the light curves outside of and within eclipses

  • K. WalterAffiliated withAstronomisches Institut, Universität Tübingen

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Abstract

An attempt is made to interpret the distortions of the light curves of semi-detached Algol systems, in terms of the absorption effects of gas streams and of the emission from the impact regions of these streams. Hypothetical models of the distortions of the light curves outside of primary eclipses are given for different locations of the luminous regions. To exhibit features of light curves of this kind, both published and unpublished observations (TW Dra, Y Psc, TV Cas) of Algol systems are used.

The existence of luminous regions is also indicated by observations of primary eclipses. For some systems (SW Cyg, RV Oph, W Del) it is shown that observations from earlier epochs may be represented by photometric solutions which are based on identical geometric parameters (radii, inclination of orbit) but imply a changed behaviour of the gas stream. It is suggested that two kinds of luminous regions exist: regions near the equatorial belt on the following side of the bright component; and regions which tend to occur at the higher latitudes of this star, possibly indicating the existence of magnetic fields.