标题： X射线观测矮新星YZ Cnc的爆发周期 显示英文标题

标题： X-ray observations through the outburst cycle of the dwarf nova YZ Cnc

摘要： 我们以两天的间隔在1998年4月6日至24日观测了YZ Cnc，覆盖了两个完整的爆发周期。 在光学爆发期间，0.1-2.4 keV的流量比平静期低，并且在爆发结束时最低。 在平静间隔期间X射线流量的下降似乎与吸积盘不稳定性简单模型的预测相矛盾。 存在小时时间尺度的变异性，但似乎与轨道相位无关。 YZ Cnc在我们1998年的观测中比之前的ROSAT观测中的X射线亮度更低。 显示英文摘要

摘要： We have observed YZ Cnc at two day intervals from 6 to 24 April 1998, covering two full outburst cycles. The 0.1-2.4 keV flux is lower during optical outburst than in quiescence, and lowest at the end of the outburst. The decline of the X-ray flux in the quiescent interval appears to be in contrast to prediction of simple models for accretion-disk instabilities. Variability on \~hour time scales is present, but appears not related to the orbital phase. YZ Cnc was less luminous in X-rays during our 1998 observations than in earlier ROSAT observations.