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AX Per is an eclipsing symbiotic binary. During active phases, deep narrowminima are observed in its light curve, and the ionization structure in thebinary changes significantly. From 2007.5, AX Per entered a new active phase.It was connected with a significant enhancement of the hot star wind.Simultaneously, we identified a variable optically thick warm (Teff ~ 6000 K)source that contributes markedly to the composite spectrum. The source waslocated at the hot star's equator and has the form of a flared disk, whoseouter rim simulates the warm photosphere. The formation of the neutraldisk-like zone around the accretor during the active phase was connected withits enhanced wind. We suggested that this connection represents a common originof the warm pseudophotospheres that are indicated during the active phases ofsymbiotic stars.

Formation of a disk structure in the symbiotic binary AX Per during its 2007-10 precursor-type activity