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QPOs in cataclysmic variables and in X-ray binaries

Journal article
Authors W. Kluzniak
J.-P. Lasota
Marek A Abramowicz
B. Warner
Published in Astron. Astrophys.
Volume 440
Pages L25-L28
ISSN 0004-6361
Publication year 2005
Published at Department of Physics (GU)
Pages L25-L28
Language en
Links dx.doi.org/10.1051/0004-6361:200500...
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology

Abstract

Recent observations, reported by Warner and Woudt, of dwarf nova oscillations (DNOs) exhibiting frequency drift, period doubling, and 1:2:3 harmonic structure, can be understood as disc oscillations that are excited by perturbations at the spin frequency of the white dwarf or of its equatorial layers. Similar quasiperiodic disc oscillations in black hole low-mass X-ray binary (LMXB) transients in a 2:3 frequency ratio show no evidence of frequency drift and correspond to two separate modes of disc oscillation excited by an internal resonance. Just as no effects of general relativity play a role in white dwarf DNOs, no stellar surface or magnetic field effects need be invoked to explain the black hole QPOs.

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