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Detection of spiral structure of the quiescent accretion disk of IP Pegasi

V. V. Neustroev·N. V. Borisov·H. Barwig·A. Bobinger·K. H. Mantel·D. Simic·S. Wolf
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Abstract

We present the results of the spectral investigations of IP Peg in quiescence. Optical spectra obtained on 6-m telescope at the Special Astrophysical Observatory (Russia), and on the 3.5-m telescope at the German-Spanish Astronomical Center (Calar Alto, Spain), have been analysed by means of Doppler tomography and phase modeling technique. This analysis has allowed us to make conclusions, that the quiescent accretion disk of IP Peg has a complicated structure. Equally with the bright spot originated in the region of interaction between the stream and the disk's particles, there are also explicit indications of the spiral shocks. We also have found that the brightness of the bright spot considerably oscillates during orbital period. The spot becomes brightest at an inferior conjunction. On the contrary, the spot is almost not visible when it is located on a distant half of the accretion disk. Apparently, it is connected to an eclipse of the bright spot by an outer edge of the accretion disk.

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V. V. Neustroev, N. V. Borisov, H. Barwig, A. Bobinger, K. H. Mantel, D. Simic, S. Wolf. 2001-10-04. Detection of spiral structure of the quiescent accretion disk of IP Pegasi. https://arxiv.org/abs/astro-ph/0110111

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