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

在矮新星爆发期间，同时进行了光学和近红外观测，以研究起源于吸积盘最外层区域的时间变化。观察发现，盘的最外层区域的一部分垂直扩张，从而使盘成为非轴对称形式。这种形变可能是由于次星对圆盘的强烈潮汐效应造成的。此外，在爆发后，磁盘不是迅速恢复到静止状态，而是通过中间状态逐渐恢复，这在本研究中首次发现。

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.