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During active phases of symbiotic binaries, an optically thick medium in theform of a flared disk develops around their hot stars. During quiescent phases,this structure is not evident. We propose the formation of a flared neutraldisk-like structure around the rotating white dwarf (WD) in symbiotic binaries.We applied the wind compression model and calculated the ionization boundariesin the compressed wind from the WD using the equation of photoionizationequilibrium. During active phases, the compression of the enhanced wind fromthe rotating WD can form a neutral disk-like zone at the equatorial plane,while the remainder of the sphere above/below the disk is ionized. Calculatedhydrogen column density throughout the neutral zone and the emission measure ofthe ionized fraction of the wind are consistent with those derived fromobservations. During quiescent phases, the neutral disk-like structure cannotbe created because of insufficient mass loss rate. Formation of the neutraldisk-like zone at the equatorial plane is connected with the enhanced wind fromthe rotating WD, observed during active phases of symbiotic binaries. Thisprobably represents a common origin of warm pseudophotospheres, indicated inthe spectrum of active symbiotic binaries with a high orbital inclination.

Ionization structure of hot components in symbiotic binaries during active phases