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Light curves of the long-period Algols are known for their complex shape(asymmetry in the eclipse, light variations outside eclipse, changes fromcycle-to-cycle), and their interpretation is not possible in the standard modelof binary stars. Complex structures present in these active Algol systems couldbe studied with the eclipse-mapping method which was successfully applied tothe new 7-color photometric observations in the Geneva system of W Cru,belonging to the isolated group of these active Algols. Several cycles of thislong-period (198.5 days) eclipsing binary have been covered by observations. Wehave used a modified Rutten's approach to the eclipse-mapping. The optimizationof the system's parameters and the recovery of the disk intensity distributionare performed using a genetic algorithm (GA). It is found that a hot componentis hidden in the thick accretion disk which confirms previous findings. Themass of the component, M1 = 8.2 Ms indicates that it is a mid-B type star. Themass-losing component is filling its critical lobe which means it is a G-typesupergiant with a mass M2 = 1.6 Ms. The disk is geometrically very extended andits outer radius is about 80% of the primary's critical lobe. A reconstructedimage reveals a rather clumpy and nonuniform brightness distribution of anaccretion disk rim in this almost edge-on seen system. This clumpyness accountsfor light curve distortions and asymmetries, as well as for secular changes.Comment: 10 pages, 5 figures, accepted for publication in A&

Indirect imaging of an accretion disk rim in the long-period interacting binary W Crucis