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Magnetic activity and evolution of Algol-type stars

Sarna, MJ
Muslimov, A
Yerli, Sinan Kaan
We examine the possibility of tracing dynamo action in mass-losing stars that are components of Algol-type binaries. Our analysis is based on the calculation of the non-conservative evolution of a system that initially consists of a 1.65-M. star with a small helium core and a 0.99-M. main-sequence companion. We perform our calculations for the evolutionary model of S Cnc in which a more massive companion fills its Roche lobe at the orbital period of the system P(orb)similar to 1.12 d. We show that to maintain the late stages of evolution of this system, which are driven by stellar 'magnetic braking', an efficient mechanism that produces large-scale surface magnetic fields in a donor star is needed. We discuss the relevance of dynamo action in a donor star to the stages of accelerated mass transfer in the evolution of Algol-type systems.