Measurement And Theoretical Studies Of Magnetic Activity In Close Binaries

The magnetic activities of the close binaries mainly refer to the form of a series special movement of the material in the close binaries under the force of strong magnetic field, or when drastic changes have been taken place in magnetic fields. It can cause a series of observation effects, such as star-spot activity, optical flare events, the uneven distribution of the chemical element abundances, stellar wind, the changes of the orbital period and the chromospherically activities.In the present thesis, we first of all introduce the basic methods of analyzing the magnetic activity of close binaries. And then, we study the light change characteristic, star-spot activities of the RS CVn-type close binaries, and the relation among the light change characteristic, the orbital period changes and magnetic activities of W UMa-type binaries. The main results are the following :1. According to tow main observation methods in study of stellar active regions, the photoelectric observation and Doppler Imaging process and by using the solutions of Milne-Eddington approximation and the gray atmosphere model, we have discussed the Doppler Imaging of rotating stellar basing on analyzing function of spectral line broadening. It is suggested that the local profile function can be given by Φ(v,M,Ψ) = K(v) * G_M (v), here K(v)is Voigt function; G_M(v) is called as the local rotation profile function. After obtaining the local profile function Φ(v,M,Ψ), we have then calculated the local line depth and analyzed Doppler Imaging procedure of star-spots, abundance of the element and magnetic field of the star surface.2. Taking the magnetic structure of the spotted active region as the magnetic mirror field and using magnetic-hydrodynamic theory we have analyzed the interaction between magnetically-confined plasma and the magnetic waves in the spotted active regions. The result shows that there is energy transport from the particles to the waves of plasma in the spotted active region. Since the magnetic wave receives the energy from the plasma, the magnetic wave's instability increases while the plasma temperature decrease. Thus the low temperature spotted region is formed.3. The photoelectric light curves of BH Virginis in 4650(A|°) and 5550(A|°) bands observed by...