Interpretation of the UBV RcIc Light Variations of the Symbiotic Binary BF Cyg during its 2006-2014 Optical Outburst

摘要

It is supposed that the variations of the depth of the orbital photometric minimum of the eclipsing symbiotic binary BF Cyg during its last eruption after 2006 is due to appearance of an accretion disc-like envelope which collimates the stellar wind of the outbursting compact object. The calculated UBV RcIc fluxes of the uneclipsed part of the envelope are in agreement with the observed residual of the depths of the first and second orbital minima.