The Origin of Warped, Precessing Disks in X-Ray Binaries

Details The Origin of Warped, Precessing Disks in X-Ray Binaries The Origin of Warped, Precessing Disks in X-Ray Binaries

1997-10-06

arxiv.org/abs/astro-ph/9710060v1

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures

Scientific paper

10.1086/311058

The radiation-driven warping instability discovered by Pringle holds considerable promise as the mechanism responsible for producing warped, precessing accretion disks in X-ray binaries. This instability is an inherently global mode of the disk, thereby avoiding the difficulties with earlier models for the precession. Here we follow up earlier work to study the linear behavior of the instability in the specific context of a binary system. We treat the influence of the companion as an orbit-averaged, quadrupole torque on the disk. The presence of this external torque allows the existence of solutions in which the direction of precession of the warp is retrograde with respect to disk rotation, in addition to the prograde solutions which exist in the absence of external torques.

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