Nonradial pulsations of accretion disks - The nature of quasi-periodic oscillations in dwarf novae
Abstract
Quasi-periodic oscillations on time scales from 30 s to 150 s, which have been observed in several dwarf novae during outburst, have been qualitatively interpreted as oscillations of the accretion disks in these systems. This is investigated quantitatively by showing that there exist nonradial oscillation modes of the disk that, being weakly coupled in the radial direction, correspond to oscillations of individual disk annuli which are periodic in phi, z, and t. The frequencies of these oscillations are directly proportional to the rotation frequency of the annulus. Because the luminosity of an annulus is largest at some intermediate radius, the oscillations are expected to be most evident for annuli near this radius.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1980
- DOI:
- 10.1086/183178
- Bibcode:
- 1980ApJ...235L.143V
- Keywords:
-
- Dwarf Stars;
- Novae;
- Oscillations;
- Stellar Mass Accretion;
- Variable Stars;
- Eigenvalues;
- Euler Equations Of Motion;
- Astrophysics