Magnetic fields and secondary rhythms in the Beta Lyrae system

In this review the results of the present-day state of the magnetic field research and its causal relationship with the secondary periods in the Beta Lyrae interacting binary system are given. The magnetic field demonstrates the complicatedtime-dependent behavior. For instance in 1981--1999 the changes of the magnetic field on the long-time-scale variability averaged 2.5; kG. The observable facts can evidence that the donor should be considered as a magnetic rotator and that around the Beta Lyrae binary system magnetosphere is formed. The presence of the donor as the magnetic rotator in the interacting binary system can produce a set of causal relationships. One of the recently originated topics is the connection between the magnetic field and the secondary periodicities in the Beta Lyrae system. First of all were considered three observable secondary periods with duration of 1.85 d, 4.74 d and 282.425 d. These and other secondary periods form the interconnected magnetohydrodynamical system of the periodicities and resonances in the Beta Lyrae system. Such secondary rhythms must change with the observable increase of the orbital period in the mass transfer process. The theoretical base for this phenomenon can be the conception of the parametric resonance when the losing matter of the donor is a variable parameter.