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The Effects of Magnetic Fields on Period Changes, Mass Transfer and Evolution of Algol Binaries

Published online by Cambridge University Press:  12 April 2016

C. T. Bolton
C. T. Bolton*
Affiliation:
David Dunlap Observatory,University of Toronto,P. O. Box 360, Richmond Hill,Ontario L4C 4Y6,CANADA

Abstract

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Variations in the magnetic pressure and flux blocking by starspots during the magnetic cycle of the cool semidetached component of an Algol binary may cause cyclic changes in the quadrupole moment and moment of inertia of the star which can cause alternate period changes. Since several different processes and timescales are involved, the orbital period changes may not correlate strongly with the indicators of magnetic activity. The structural changes in the semidetached component can also modulate the mass transfer rate. Sub-Keplerian velocities, supersonic turbulence, and high temperature regions in circumstellar material around the accreting star may all be a consequence of magnetic fields embedded in the flow. Models for the evolution of Algols which include the effects of angular momentum loss (AML) through a magnetized wind may have underestimated the AML rate by basing it on results from main sequence stars. Evolved stars appear to have higher AML rates, and there may be additional AML in a wind from the accretion disk.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 107: Algols , 1989 , pp. 311 - 322
Copyright
Copyright © Kluwer 1989

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