Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.274...61g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 274, Issue 1, pp. 61-74.
Astronomy and Astrophysics
Astronomy
14
Accretion, Accretion Discs, Waves, Methods: Numerical, Binaries: Close, Stars: Oscillations
Scientific paper
We provide one-dimensional time-dependent calculations of optically thick and geometrically thin accretion disc boundary layers in cataclysmic variables (CVs), by using the Chebyshev spectral method. Our numerical calculations show that the properties of quasi-periodic oscillations (QPOs) are characteristic of acoustic waves propagating in the inner region of accretion discs for low values of alpha. Moreover, the observations provide significant evidence in support of the acoustic nature of the QPOs. The relative amplitudes of the QPOs (as observed in the optical and the X-ray), the autocorrelation function of their light curve, and the relation between the QPO periods and their decay times are all characteristic of acoustic waves.
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