2D and 3D MHD simulations of disk accretion by rotating magnetized stars: Search for variability

被引：0

作者：

Romanova, Marina M. ^{[1
]}

Kulkarni, Akshay ^{[1
]}

Long, Min

Lovelace, Richard V. E. ^{[1
]}

Wick, Justin V. ^{[1
]}

Ustyugova, Galina V. ^{[2
,3
]}

Koldoba, Alexander V. ^{[2
,3
]}

机构：

[1] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[2] Russian Acad Sci, Inst Math Modeling, Moscow 117901, Russia

[3] Russian Acad Sci, Keldysh Inst Appl Math, Moscow 117901, Russia

来源：

SPECTRA AND TIMING OF COMPACT X-RAY BINARIES | 2006年 / 38卷 / 12期

关键词：

accretion disks; magnetized stars; dipole field; X-ray; variability;

D O I：

暂无

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

We performed 2D and full 3D magnetohydrodynamic simulations of disk accretion to a rotating star with an aligned or misaligned dipole magnetic field. We investigated the rotational equilibrium state and derived from simulations the ratio between two main frequencies: the spin frequency of the star and the orbital frequency at the inner radius of the disk. In 3D simulations we observed different features related to the non-axisymmetry of the magnetospheric flow. These features may be responsible for high-frequency quasi-periodic oscillations (QPOs). Variability at much lower frequencies may be connected with restructuring of the magnetic flux threading the inner regions of the disk. Such variability is specifically strong at the propeller stage of evolution. (c) 2006 Published by Elsevier Ltd on behalf of COSPAR.

引用

页码：2887 / +

页数：2

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