The ‘outside‐in’ outburst of HT Cassiopeiae
The ‘outside‐in’ outburst of HT Cassiopeiae
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HT Cassiopeiae 的“由外而内”爆发
DOI：
10.1046/j.1365-8711.1999.03001.x
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发表时间：
1999
影响因子：
4.8
通讯作者：
N. James
中科院分区：
文献类型：
--
作者：
Z. Ioannou;T. Naylor;W. Welsh;M. S. Catalan;W. Worraker;N. James
我们展示了 1995 年 11 月喷发期间矮新星系统 HT Cas 的光度观测结果。这些数据包括日食爆发前的第一个双色观测结果。他们表明，在爆发过程中，圆盘明显偏离稳态模型，但包含约 4Rwd 的内圆盘截断半径和半张角为 10° 的“张开”圆盘可产生可接受的拟合。与静态测量相比，发现该圆盘在爆发开始时已膨胀至约 0.41RL1。然后，在喷发的最后阶段，吸积盘的半径逐渐减小，达到 < 0.32RL1。在喷发之前和之后还观察到了静止日食，并计算了修订后的星历。
We present results from photometric observations of the dwarf nova system HT Cas during the eruption of 1995 November. The data include the first two-colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady-state models, but the inclusion of an inner-disc truncation radius of about 4Rwd and a ‘flared’ disc of semi-opening angle of 10° produces acceptable fits. The disc is found to have expanded at the start of the outburst to about 0.41RL1, as compared with quiescent measurements. The accretion disc then gradually decreases in radius reaching < 0.32RL1 during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.