Magnetized Accreting Stars: Studies of the Inner Accretion Disk Edge by a Magnetohydrodynamical Approach. I. Construction and Analysis of Magnetopause Equilibria

Details Magnetized Accreting Stars: Studies of the Inner Accretion Disk Edge by a Magnetohydrodynamical Approach. I. Construction and Analysis of Magnetopause Equilibria Magnetized Accreting Stars: Studies of the Inner Accretion Disk Edge by a Magnetohydrodynamical Approach. I. Construction and Analysis of Magnetopause Equilibria

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519..658r&link_type=abstract

The Astrophysical Journal, Volume 519, Issue 2, pp. 658-666.

Astronomy and Astrophysics

Astronomy

3

Accretion, Accretion Disks, Galaxies: Active, Magnetohydrodynamics: Mhd, Stars: Neutron

Scientific paper

In this paper a numerical model of the interaction between the accretion disk and the magnetosphere of an accreting object (e.g., a neutron star) is used to study mechanisms that can lead to fast accretion of matter due to magnetic forces. The framework of magnetohydrodynamics (MHD) provides a simple but powerful tool for such a study on a semiglobal scale. The aim of this work is the construction of stationary states that describe the inner-edge region of the accretion disk with the star's rotating magnetosphere supporting the inner disk edge against gravitation. The equilibrium magnetic fields are computed numerically by a finite difference scheme using the magnetofriction method within ideal magnetohydrodynamics. To study the mass loading onto the magnetosphere we vary disk mass density and pressure. Magnetosphere rotation speed and magnetopause thickness are additonal variables contributing to the shape of the magnetosphere and the currents in the magnetopause at the disk edge.

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