Bending instabilities in magnetized accretion disks

Details Bending instabilities in magnetized accretion disks Bending instabilities in magnetized accretion disks

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..631a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 631

Astronomy and Astrophysics

Astronomy

13

Accretion Disks, T Tauri Stars, Stellar Magnetic Fields, Magnetohydrodynamic Stability, Stellar Magnetospheres, Lines Of Force, Stellar Rotation, Bending, Stellar Spectra

Scientific paper

We study the global bending modes of a thin annular disk subject to both an internally generated magnetic field and a magnetic field due to a dipole embedded in the central star with axis aligned with the disk rotation axis. When there is a significant inner region of the disk corotating with the star, we find spectra of unstable bending modes. These may lead to elevation of the disk above the original symmetry plane facilitating accretion along the magnetospheric field lines. The resulting nonaxisymmetric disk configuration may result in the creation of hotspots on the stellar surface and the periodic photometric variations observed in many classical T Tauri stars. Time-dependent behavior may occur including the shadowing of the central source in magnetic accretors even when the dipole and rotation axes are aligned.

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