Spin-up/spin-down of magnetized stars with accretion discs and outflows

  title={Spin-up/spin-down of magnetized stars with accretion discs and outflows},
  author={Richard V. E. Lovelace and Marina M. Romanova and Gennady S Bisnovatyi-Kogan},
  journal={Monthly Notices of the Royal Astronomical Society},
An investigation is made of disk accretion of matter onto a rotating star with an aligned dipole magnetic field. A new aspect of this work is that when the angular velocity of the star and disk differ substantially we argue that the $\bf B$ field linking the star and disk rapidly inflates to give regions of open field lines extending from the polar caps of the star and from the disk. The open field line region of the disk leads to the possibility of magnetically driven outflows. An analysis is… 

On the Rotational Dynamics of Magnetically Threaded Disks around Neutron Stars

We investigate the rotational dynamics of disk accretion around a strongly magnetized neutron star with an aligned dipole field. The magnetospheric field is assumed to thread the disk plasma both


We present a model for the rotational evolution of a young, solar mass star interacting with an accretion disk. The model incorporates a description of the angular momentum transfer between the star

Jet Outbursts from Fast Accretion in a Disk with Zebra-Stripe Magnetic Field

The optical, X-ray, and gamma-ray outbursts, as well as the associated formation of relativistically moving components of parsec-scale jets of some active galactic nuclei (AGNs) are interpreted as

Partial Field Opening and Current Sheet Formation in the Disk Magnetosphere

In this paper I analyze the process of formation of thin current structures in the magnetosphere of a conducting accretion disk in response to the field-line twisting brought about by the rotation of

Magnetic star-disk interaction in classical T Tauri systems

We simulate the impact of a dipolar stellar magnetic field rooted in a classical T Tauri star on the accretion disk and the halo above using a 2.5D finite difference code. The gas is assumed

Propeller-driven Outflows and Disk Oscillations

We report the discovery of propeller-driven outflows in axisymmetric magnetohydrodynamic simulations of disk accretion to rapidly rotating magnetized stars. Matter outflows in a wide cone and is

Magnetic Star-Disk Coupling in Classical T Tauri Systems

We study the interaction between a dipolar magnetic field rooted in the central star and the circumstellar accretion disk in a classical T Tauri system. The MHD equations, including radiative energy

Dynamics of Magnetic Loops in the Coronae of Accretion Disks

Axisymmetric magnetohydrodynamic (MHD) simulations are used to study the evolution of general magnetic field configurations where a magnetic field B threads different radii of a differentially

The Propeller Regime of Disk Accretion to a Rapidly Rotating Magnetized Star

The propeller regime of disk accretion to a rapidly rotating magnetized star is investigated here for the first time by axisymmetric 2.5-dimensional magnetohydrodynamic simulations. An expanded,

Screening of the Magnetic Field of Disk Accreting Stars

An analytical model is developed for the screening of the external magnetic field of a rotating, axisymmetric neutron star due to the accretion of plasma from a disk. The decrease of the field occurs



Astrophysics of Neutron Stars

This book provides a description of the current state of experimental and theoretical investigations of neutron stars in all their manifestations. The approach adopted leads to topics in plasma

Accretion-driven stellar X-ray sources

This book presents papers on accretion-driven stellar X-ray sources. Topics covered include X-ray bursters and the X-ray sources of the galactic bulge; X-ray emission from normal galaxies; optical

Cosmical magnetic fields

Magnetic Field Generation in Electrically-Conducting Fluids.By H. K. Moffatt. Pp. 343. (Cambridge University Press: Cambridge and London, 1978.) £15.50.

Sov. Astron

  • Sov. Astron
  • 1973

Geophys. Astrophys. Fluid Dynamics

  • Geophys. Astrophys. Fluid Dynamics
  • 1992

MHD Instabilities (Cambridge: MIT Press) Chap

  • ApJ (Letters),
  • 1984

X-Ray Binaries, NASA SP-389 (National Technical Information Service

  • X-Ray Binaries, NASA SP-389 (National Technical Information Service
  • 1976

Astron. & Astrophysics

  • Astron. & Astrophysics
  • 1972

X-Ray Binaries, NASA SP-389 (National Technical Information

  • 1976