Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235l.143v&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 235, Feb. 1, 1980, p. L143-L147. Research supported by the Ministere
Astronomy and Astrophysics
Astrophysics
39
Dwarf Stars, Novae, Oscillations, Stellar Mass Accretion, Variable Stars, Eigenvalues, Euler Equations Of Motion
Scientific paper
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.
Van Horn Hugh M.
Wesemael François
Winget Don E.
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