WZ Sge静止期的长期变化：内盘空腔的发展
Secular changes in the quiescence of WZ Sge: the development of a cavity in the inner disk
摘要：
我们发现，在光学平静的灾难性变量WZ Sge约半个大小之间的超爆发变暗。我们把这种变暗与吸积盘内部空腔的发展联系起来。我们认为，当空洞足够大时，物质的吸积受白矮星的磁场控制，弱磁白矮星产生脉动。空洞形成的时间尺度约为十年，并持续整个静止期。这样一个空腔可以很好地容纳所提出的磁螺旋桨模型的WZ Sge，在静止质量被驱逐的磁性白矮星从内部区域的吸积盘更大的半径。
英文摘要：
We find a dimming during optical quiescence of the cataclysmic variable WZ Sge by about half a magnitude between superoutbursts. We connect the dimming with the development of a cavity in the inner part of the accretion disk. We suggest that, when the cavity is big enough, accretion of material is governed by the magnetic field of the white dwarf and pulsations from the weakly magnetic white dwarf appear. The time scale of forming the cavity is about a decade, and it persists throughout the whole quiescent phase. Such a cavity can be accommodated well by the proposed magnetic propeller model for WZ Sge, where during quiescence mass is being expelled by the magnetic white dwarf from the inner regions of the accretion disk to larger radii.
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