QPOs in Cataclysmic Variables and in X-ray Binaries

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 quasi-periodic 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.

Revised version. Astronomy & Astrophysics (Letters), in press

References in corpus (23)

• Millisecond Oscillations in X-Ray Binaries
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• A precise determination of angular momentum in the black hole candidate GRO J1655-40
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Cited by in corpus (8)

• The Masses and Evolutionary State of the Stars in the Dwarf Nova SS Cygni
• Dwarf Nova Oscillations and Quasi-Periodic Oscillations in Cataclysmic Variables, IV. Observations of Frequency Doubling and Tripling in VW Hyi
• The Interpretations For the Low and High Frequency QPO Correlations of X-ray Sources Among White Dwarfs, Neutron Stars and Black Holes
• Global Disk Oscillation Modes in Cataclysmic Variables and Other Newtonian Accretors
• Epicyclic frequencies of spheroidal stars with non-uniform density
• For whom the disc tolls
• Eigenmodes of trapped horizontal oscillations in accretion disks
• Microlensing in phase space II: Correlations analysis