X-Ray Observations of Cygnus X-2

Details X-Ray Observations of Cygnus X-2 X-Ray Observations of Cygnus X-2

2001-10-25

arxiv.org/abs/astro-ph/0110553v1

Astronomy and Astrophysics

Astrophysics

22 pages, accepted to the Astrophysical Journal

Scientific paper

We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. The source was in the so-called high overall intensity state and in less than 24 hours went through all three branches of the Z-track. The continuum x-ray spectrum could be described by the absorbed sum of a soft thermal component, modeled as either a blackbody or a multicolor disk blackbody, and a Comptonized component. The timing power spectrum showed several components including quasiperiodic oscillations in the range 28-50 Hz while the source was on the horizontal branch (horizontal branch oscillation; HBO). We found that the HBO frequency was well correlated with the parameters of the soft thermal component in the x-ray spectrum. We discuss implications of this correlation for models of the HBO.

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