Turbulent fluctuations and the excitation of Z Cam outbursts
Turbulent fluctuations and the excitation of Z Cam outbursts
复制标题
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
中科院分区:
文献类型:
--
作者:
Ross J
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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影响因子:
6.5
作者:
Valentin Buat;J. Hameury;J. Lasota
通讯作者:
J. Lasota
影响因子:
4.8
作者:
J. Papaloizou;J. Faulkner;D. Lin
通讯作者:
D. Lin
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
M. Viallet;J. Hameury
通讯作者:
J. Hameury
DOI:
10.1093/mnras/stx564
发表时间:
2017-03
期刊:
arXiv: High Energy Astrophysical Phenomena
影响因子:
--
作者:
J. Ross;H. Latter;M. Tehranchi
通讯作者:
J. Ross;H. Latter;M. Tehranchi
DOI:
--
发表时间:
1983
期刊:
影响因子:
--
作者:
J. Faulkner;D. Lin;J. Papaloizou
通讯作者:
J. Papaloizou