Low-Frequency Modes in Accretion Disks

Details Low-Frequency Modes in Accretion Disks Low-Frequency Modes in Accretion Disks

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.4103i&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #41.03; Bulletin of the American Astronomical Society, Vol. 25, p.1352

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The question of the existence of low-frequency modes in accretion disks is reexamined through use of a recently developed formalism for treating adiabatic perturbations of rapidly rotating systems. It is argued that this formalism is more accurate than those used in other analyses. The present analysis includes a simple prescription for estimating nonbarotropic corrections, associated with nonadiabatic temperature gradients, to barotropic modes. It is found that in certain cases one-armed low-frequency modes do exist in the inner regions of disks, with frequencies much less than the rotation angular velocity. It is shown that modest nonadiabatic gradients have only small effects on the frequencies.

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