标题： WZ 蛇夫座 - 一个古老的矮新星 显示英文标题

标题： WZ Sagittae - an old dwarf nova

摘要： 我们模拟了WZ天蝎座在长时间休眠期间吸积盘的演化。 我们发现，从爆发光度得出的盘中大量质量是一个严格的限制，并要求$\alpha_c$$\approx$0.001，这与一些最近的建议相矛盾。 我们在计算中包括了内盘空洞的形成以及由于角动量再分配导致的盘的增长。 我们发现了一种新的盘演化模式。 盘是准稳态的。 只有大约一半从伴星转移过来的质量流经盘，另一半用于建立持续增长的外盘。 当达到3:1共振半径时，盘的增长结束。 从那时起，所有转移的物质都向内流动，表面密度增加，导致几年内发生爆发。 我们预测在此最后阶段低光度下会出现超级洪峰。 我们讨论了预期的X射线、白矮星质量以及WZ天蝎座的距离。 显示英文摘要

摘要： We model the evolution of the accretion disk of WZ Sagittae during the long quiescence. We find that the large amount of mass in the disk derived from the outburst luminosity is a severe constraint and demands values of $\alpha_c$ $\approx$ 0.001 in contradiction to some recent suggestions. We include in our computations the formation of an inner disk hole and the growth of the disk due to redistribution of angular momentum. We find a new mode of disk evolution. The disk is quasi-stationary. Only about half of the mass transfered from the companion star flows through the disk, the other half is needed to build up the steadily growing outer disk. When the 3:1 resonance radius is reached the disk growth ends. From then on all transferred matter flows inward, the surface density increases, leading to an outburst within a few years. We predict superhumps at low luminosity during this last phase. We discuss X-rays expected, the white dwarf mass and distance to WZ Sagittae.