Long-Term Evolution of Z-track in Cyg X-2

Details Long-Term Evolution of Z-track in Cyg X-2 Long-Term Evolution of Z-track in Cyg X-2

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.2517b&link_type=abstract

American Astronomical Society, HEAD meeting #8, #25.17; Bulletin of the American Astronomical Society, Vol. 36, p.956

Astronomy and Astrophysics

Astronomy

Scientific paper

The low-mass X-ray binary Z-source Cygnus X-2 displays a high amplitude, non-periodic long-term X-ray modulation with a timescale on the order of five to ten times its 9.8 day orbital period. The long-term modulation is often attributed to a warped, precessing accretion disk, however if this model is correct then the precession period is not stable. There are now (June 2004) just over 200 pointed RXTE observations of the Cyg X-2, spanning more than 3000 days. These observations cover fairly evenly the range of observed RXTE count rates (600-2400 counts/s/PCU). We use this collection of observations to investigate the evolution of the Z-shape in the color-color diagram and search for correlations with the long-term modulation. We also compare the time variability of the X-ray components of a common spectral model for Cyg X-2 with the long-term flux variability and the Z-shape evolution.

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