Observational Study of the Process of the Angular Momentum Transfer in the Outermost Region of Accretion Disks in Dwarf Novae

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Simultaneous optical and near-infrared observations were performed during outbursts of dwarf novae in order to investigate the temporal variations which originate in the outermost region of accretion disks. The observation revealed that a part of the outermost region of the disks expands vertically, and thereby the disk becomes a non-axisymmetric form. This deformation is probably due to the strong tidal effect to the disk from the secondary star. In addition, after outbursts, the disk returned to a quiescent state not promptly, but gradually through an intermediate state, which was discovered in this study for the first time.