Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42...99k&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 1, 1990, p. 99-113.
Astronomy and Astrophysics
Astronomy
57
Accretion Disks, Stellar Oscillations, X Ray Binaries, Black Body Radiation, Black Holes (Astronomy), Corrugating, Neutron Stars, Trapping, X Ray Spectra
Scientific paper
One-armed corrugation waves (one-armed warps) are very low-frequency modes of oscillations in relativistic, geometrically thin disks. It is shown that some modes of such one-armed corrugation waves can be trapped in the innermost region of accretion disks. The necessary conditions for trapping to occur are that a pressure maximum exists in the inner region of the disks, as in geometrically thick disks, and that the rotation of the central object is slow. In the case of low-mass X-ray binaries, the frequencies of these trapped oscillations can become comparable with those of observed quasi-periodic oscillations (QPOs) for reasonable values of parameters. The trapped oscillations are, however, generally leaked toward the central object, because the trapped region is too close to the inner edge of the disks. This leakage makes the oscillations quasi-periodic, and also will induce time variations in X-rays from the neutron star surface.
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