On the origin of episodic accretion in dwarf novae

被引：96

作者：

Gammie, CF

Menou, K

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Observ Paris, CNRS, DARC, F-92195 Meudon, France

来源：

ASTROPHYSICAL JOURNAL | 1998年 / 492卷 / 01期

基金：

美国国家航空航天局;

关键词：

accretion; accretion disks; MHD; novae; cataclysmic variables; turbulence;

D O I：

10.1086/311091

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We show that dwarf nova disks in quiescence have rather low magnetic Reynolds numbers, of order 10(3). 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.

引用

页码：L75 / L78

页数：4

共 34 条

[1]

[Anonymous], 1981, IPPJAM19

[2] Dynamo-driven accretion disks and dwarf nova eruptions [J].