TY - JOUR
T1 - 2D and 3D MHD simulations of disk accretion by rotating magnetized stars
T2 - Search for variability
AU - Romanova, Marina M.
AU - Kulkarni, Akshay
AU - Long, Min
AU - Lovelace, Richard V.E.
AU - Wick, Justin V.
AU - Ustyugova, Galina V.
AU - Koldoba, Alexander V.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Accretion disks
KW - Dipole field
KW - Magnetized stars
KW - Variability
KW - X-ray
UR - http://www.scopus.com/inward/record.url?scp=33751175230&partnerID=8YFLogxK
U2 - 10.1016/j.asr.2006.04.019
DO - 10.1016/j.asr.2006.04.019
M3 - Article
AN - SCOPUS:33751175230
SN - 0273-1177
VL - 38
SP - 2887
EP - 2892
JO - Advances in Space Research
JF - Advances in Space Research
IS - 12
ER -