Double dataset eclipse mapping of IP peg

The classical eclipse mapping method, developed by Horne (1985), allows to get a deeper insight into the spatial structure of accretion disks. Reconst ructing a two-dimensional intensity distribution from an one-dimensional da taset of the light curve, the method is not artifact-free and the result de pends on the used default image. Using simultaneously recorded trailed spec tra and photometry as a double dataset, we are able to reconstruct accretio n disks nearly without artifacts. It is possible to resolve structures in t he accretion disk with very high clarity and reliability. The double datase t eclipse mapping is applied to the dataset of the cataclysmic variable IP Peg. The reconstructions show an asymmetric disk with a second spot, opposi te to the hot-spot of the impact region of the gas-stream in the Doppler-ma ps which can be now unequivocally assigned in the eclipse-maps to emission in the acjacence of the hot-spot, to the central part of the accretion disk and a region opposite to the hot-spat at the outer part of the disk. The p ossible origin and nature of these features are discussed.