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Astron. Astrophys. 348, 145-153 (1999)

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Double dataset eclipse mapping of IP Peg

Andreas Bobinger 1, Heinz Barwig 1, Hauke Fiedler 1, Karl-Heinz Mantel 1, Damir imi 2 and Sebastian Wolf 3

1 Universitäts-Sternwarte, Scheinerstrasse 1, D-81679 München, Germany
2 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse 1, D-85740 Garching, Germany
3 ESO - European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany

Received 9 December 1998 / Accepted 9 April 1999


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

Key words: accretion, accretion disks – stars: novae, cataclysmic variables – stars: individual: IP Peg

Send offprint requests to: A. Bobinger (bobinger@usm.uni-muenchen.de)

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© European Southern Observatory (ESO) 1999

Online publication: July 16, 1999