Quasi-periodic brightness oscillations of the dwarf nova SS Cyg and their magnetic origin

Details Quasi-periodic brightness oscillations of the dwarf nova SS Cyg and their magnetic origin Quasi-periodic brightness oscillations of the dwarf nova SS Cyg and their magnetic origin

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..462g&link_type=abstract

Astronomy Reports, Volume 43, Issue 7, July 1999, pp.462-470

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Observations are analyzed of rapid variability of the cataclysmic variable SS Cyg during a peculiar flare in August 1993. The observations were made using the AZT-11 telescope of Abastumani Observatory, Republic of Georgia. The main time scales for the quasi-periodic brightness oscillations (QPOs) are determined using wavelet analysis. The brightness oscillations reveal for the first time the effect of a low-dimension strange attractor with a characteristic time scale of one to ten minutes. This phenomenon can be explained qualitatively by an "impact oscillator" model (shocks in a freely oscillating accretion disk). One possible physical mechanism for the QPOs is a nonlinear current-sheet oscillation regime in a magnetized accretion disk.

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