On the Origin of Episodic Accretion in Dwarf Novae

On the Origin of Episodic Accretion in Dwarf Novae
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矮新星间歇性吸积的起源

DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
Kristen Menou
Kristen Menou
中科院分区：
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文献类型：
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作者：
C. Gammie;Kristen Menou

文献摘要

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我们发现，处于静止状态的矮新星盘具有相当低的磁雷诺数，为 103 级。磁化吸积盘的数值模拟表明，在这些条件下，磁流体动力湍流和相关的角动量传输急剧减少。这可能是矮新星盘中间歇性吸积的物理起源。如果是这样，则需要修改标准磁盘不稳定模型。
We show that dwarf nova disks in quiescence have rather low magnetic Reynolds numbers, of order 103. Numerical simulations of magnetized accretion disks suggest that under these conditions magnetohydrodynamic turbulence and the associated angular momentum transport is sharply reduced. This could be the physical origin of episodic accretion in dwarf nova disks. If so, the standard disk instability model needs to be revised.