PREDNASAJUCI / LECTURER Augustin Skopal NAZOV / TITLE : The origin of the supersoft X-ray--optical/UV flux anticorrelation in the symbiotic binary AG Draconis ABSTRAKT / ABSTRACT : AG Draconis produces a strong supersoft X-ray emission. The X-ray and optical/UV fluxes are in a strict anticorrelation throughout the active and quiescent phases. In my lecture I will explain this flux anticorrelation by modeling the X-ray to near-IR spectral energy distribution at different levels of the star's brightness. I found that the flux anticorrelation is caused by the variable wind from the hot star. The enhanced wind gives rise to the optical bursts by reprocessing high-energy photons from the Lyman continuum to the optical/UV. (preprint available from arXiv:0908.1624, http://www.aanda.org/ in "Forthcoming", Stellar structure and evolution)