Magnetically Driven Precession of Warped Disks and Variabilities in Accreting neutron stars

Details Magnetically Driven Precession of Warped Disks and Variabilities in Accreting neutron stars Magnetically Driven Precession of Warped Disks and Variabilities in Accreting neutron stars

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.2705l&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #27.05; Bulletin of the American Astronomical Society, Vol. 33, p.1350

Astronomy and Astrophysics

Astronomy

Scientific paper

The inner region of the accretion disk around a magnetized neutron star is subjected to magnetic torques that induce warping and precession of the disk. These torques arise from interactions between the stellar field and the induced electric currents in the disk. We carry out a global analysis of warping/precession modes in a viscous accretion disk, and show that under a wide range of conditions typical of accreting X-ray pulsars, the magnetic warping torque can overcome viscous damping and make the mode grow. The warping/precession modes are concentrated near the inner edge the disk (at the magnetosphere-disk bounary), and can give rise to variabilities or quasi-periodic oscillations (QPOs) in the X-ray/UV/optical fluxes from X-ray pulsars. We examine the observed properties of mHz QPOs in several systems (such as 4U 1626-67), and suggest that some hitherto unexplained QPOs are the results of magnetically driven disk warping/precession. This work is supported in part by NSF grant AST 9986740.

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