Turbulent fluctuations and the excitation of Z Cam outbursts

Turbulent fluctuations and the excitation of Z Cam outbursts
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湍流波动与 Z Cam 爆发的激发

DOI:
10.1093/mnras/stx1212
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发表时间:
2017
影响因子:
4.8
通讯作者:
Ross J
Ross J
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ross J

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Z Cam变星是矮新星的一个子类,位于爆发(“极限环”)和非爆发(“静止”)状态之间的全局分叉附近。据信,第二颗星星的质量注入率的变化引发了两种状态之间的转变。在本文中,我们探讨了这些转变的另一种触发器:随机波动盘的湍流粘度。我们采用简单的一个区域和全球粘性模型,虽然不适合详细匹配观察到的光变曲线,清楚地表明,湍流盘波动诱导爆发时,系统是足够接近的全球分叉点。虽然模型很容易产生观察到的“爆发/下降”对所展示的Z凸轮和新星样变量,他们努力产生长列车的爆发。我们的结论是,质量传递的变化是占主导地位的物理过程,确定整体Z凸轮静止/爆发模式,但粘性随机性提供了一个额外的成分,解释一些观察到的次要功能。
Z Cam variables are a subclass of dwarf nova that lie near a global bifurcation between outbursting (‘limit cycle’) and non-outbursting (‘standstill’) states. It is believed that variations in the secondary star's mass-injection rate instigate transitions between the two regimes. In this paper, we explore an alternative trigger for these transitions: stochastic fluctuations in the disc's turbulent viscosity. We employ simple one-zone and global viscous models which, though inappropriate for detailed matching to observed light curves, clearly indicate that turbulent disc fluctuations induce outbursts when the system is sufficiently close to the global bifurcation point. While the models easily produce the observed ‘outburst/dip’ pairs exhibited by Z Cam and Nova-like variables, they struggle to generate long trains of outbursts. We conclude that mass transfer variability is the dominant physical process determining the overall Z Cam standstill/outburst pattern, but that viscous stochasticity provides an additional ingredient explaining some of the secondary features observed.
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发表时间: 2001
影响因子: 6.5
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DOI: --
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期刊:
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