Formation of magnetized spatial structures in the Beta Lyrae system II. Reflection of magnetically controlled structures in the visible spectrum

TL;DR

This paper models magnetized accretion structures in Beta Lyrae, linking magnetic field configurations to observable spectral variability, revealing how magnetic poles influence matter outflows and accretion dynamics.

Contribution

It introduces a new model connecting donor magnetic field geometry with spectral line variability in Beta Lyrae, highlighting the role of magnetic poles in accretion processes.

Findings

Correlation between magnetic field variability and spectral line changes

Identification of magnetic polar regions influencing matter outflows

Enhanced understanding of accretion flow dynamics in binary systems

Abstract

This article proposes a picture of magnetized accretion structures formed during the mass transfer in the Beta Lyrae system. It is shown that the structure of the gaseous flows between the donor and the gainer is due to the spatial configuration of the donor magnetic field. Its dipole axis is deviated substantially from the line joining the centers of the components and is inclined to the orbital plane of the binary system; the center of the magnetic dipole is displaced from the donor center toward the gainer. The surface around the donor magnetic pole, which is close to the gainer, is a region of an additional matter loss from the donor surface. The effective collision of the magnetized plasma with the accretion disk is enhanced by the fast counter-rotation of this disk, especially in the secondary quadrature phases, in which the high-temperature medium and the system of formed accretion flows are observed. This concept is demonstrated, primarily, in the obvious correlations between the phase variability of the donor magnetic field and the corresponding variability of the dynamic and energy characteristics of the various complex lines. This refers to the behavior of the radial velocity curves of the emission-absorption lines formed in the gaseous structures of type H$\alpha$, HeI $\lambda$ 7065, or the variability of their equivalent width and intensity, and the variability of conventional absorption lines of the donor atmosphere. This is true for the phase variability of the absolute flux in the H$\alpha$ emission line and the fast varying of the continuum in the H$\alpha$ region as certain parameters, which reflect the phase variability of the donor magnetic field. This approach made it possible to determine the phase boundaries of the location of the magnetic polar region on the donor surface above which the matter outflows are formed.