Z Cam stars: A particular response to a general phenomenon
Z Cam stars: A particular response to a general phenomenon
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Z Cam 明星：对普遍现象的特殊反应
DOI：
10.1051/0004-6361:20010176
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发表时间：
2001
影响因子：
6.5
通讯作者：
J. Lasota
中科院分区：
文献类型：
--
作者：
Valentin Buat;J. Hameury;J. Lasota
我们表明，如果能量方程包括质量传递流冲击和潮汐扭矩对外盘的加热，并且如果来自次级的质量传递率在稳定性临界值附近变化约 30%，则盘不稳定性模型可以重现 Z Cam 星的所有观测到的特性。特别是，爆发最大值和静止状态之间的震级差异对应于观测结果，所有爆发都是由内而外的类型，并且可以分为两类：观察到的长（宽）爆发和短（窄）爆发。质量转移率波动应该发生在其他矮新星中，但可以排除类似于在磁系统（AM Her's 和一些 DQ Her's）和一些类新星系统（VY Scl's）中观察到的变化，其中 _ M 在低态期间变得非常小；这些会产生小型爆发，虽然可以检测到，但从未被观察到。
We show that the disc instability model can reproduce all the observed properties of Z Cam stars if the energy equation includes heating of the outer disc by the mass-transfer stream impact and by tidal torques and if the mass-transfer rate from the secondary varies by about 30% around the value critical for stability. In particular the magnitude dierence between outburst maxima and standstills corresponds to observations, all outbursts are of the inside-out type and can be divided into two classes: long (wide) and short (narrow) outbursts, as observed. Mass transfer rate fluctuations should occur in other dwarf novae but one can exclude variations similar to those observed in magnetic systems (AM Her's and some DQ Her's) and some nova-like systems (VY Scl's), in which _ M become very small during low states; these would produce mini-outbursts which, although detectable, have never been observed.