Computer Science
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.342..775f&link_type=abstract
Nature (ISSN 0028-0836), vol. 342, Dec. 14, 1989, p. 775-777. Research supported by the University of Illinois, NASA, and NSF.
Computer Science
91
Magnetohydrodynamics, Stellar Mass, Stellar Mass Accretion, Stellar Oscillations, X Ray Binaries, Neutron Stars, Optical Thickness, Periodic Variations, Stellar Luminosity
Scientific paper
Quasi-periodic intensity oscillations with frequencies in the range 6-10 Hz, called normal-branch oscillations (NBOs), have recently been discovered in luminous low-mass X-ray binary systems. The results are reported of numerical simulations of the approximately radial accretion flow expected near the neutron-star component, which show that the flow becomes overstable when the luminosity rises to within a few percent of the Eddington luminosity. If the radial inflow begins about 300 km from the neutron star, the frequency of the oscillations is about 5-10 Hz, comparable to the observed frequencies of NBOs. The time variation in optical depth is substantial, whereas the variation in luminosity is relatively small. The predicted amplitudes and phases of the resulting intensity oscillations agree with observations of the NBOs.
Fortner B.
Lamb Frederick K.
Miller Guy S.
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