SS Cygni-A Nonlinear Look at 100 Years of AAVSO Data

Details SS Cygni-A Nonlinear Look at 100 Years of AAVSO Data SS Cygni-A Nonlinear Look at 100 Years of AAVSO Data

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003javso..31..138j&link_type=abstract

The Journal of the American Association of Variable Star Observers, vol. 31, no. 2, p. 138-145

Physics

3

Ss Cygni, Cataclysmic Variables

Scientific paper

A full nonlinear time series analysis was conducted of 100 years of visual observations from the American Association of Variable Star Observers (AAVSO) International Database for the cataclysmic variable SS Cygni. Intensity was obtained from the AAVSO magnitude data using: F(L)=10{-(0.4(visual magnitude)+8.43)}. Intensity is a "better" dynamical variable because energy couples all the active degrees of freedom. An intensity phase space portrait was reconstructed in 3-D using time delay coordinates. A series of Poincare sections was obtained. The Poincare section return times suggest a long-term periodicity of 52 years. We also obtained the times between outbursts in a more traditional manner, the outbursts being defined with respect to a baseline determined by the adjacent quiescent sections. Excellent agreement was found between these two approaches. An observed region of discrepancy is for an interval containing many lower amplitude shorter outbursts. Earlier reports using the O-C method indicated a long-term variation on the order of at least 100 years, thus it remains to be seen whether we are detecting a fundamental frequency or its first harmonic.

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