Quasi-periodic oscillations in luminous accretion discs

Details Quasi-periodic oscillations in luminous accretion discs Quasi-periodic oscillations in luminous accretion discs

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..684o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 15, 1991, p. 684-692.

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Accretion Disks, Computational Astrophysics, Neutron Stars, Stellar Oscillations, X Ray Binaries, Optical Thickness, Power Spectra, Stellar Luminosity, Stellar Models, Stellar Temperature

Scientific paper

The time-dependent evolution of radial pulsational instabilities in luminous accretion discs around neutron stars, is examined using a one-dimensional hydrodynamic code. The observed instability, induces large-amplitude oscillations in accretion rates and small modulations in temperature and surface density in the inner part of the disk, both with local Keplerian frequencies. Oscillation amplitudes are greatly increased by the presence of thermal relaxation oscillations when the disk is radiation-pressure dominated and the viscous stress is prescribed as proportional to the total pressure. Implications of the model are discussed in the context of quasi-periodic oscillations observed in low-mass X-ray binaries.

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