X-Ray Spectral and Timing Observations of Cygnus X-2

Details X-Ray Spectral and Timing Observations of Cygnus X-2 X-Ray Spectral and Timing Observations of Cygnus X-2

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...567.1091p&link_type=abstract

The Astrophysical Journal, Volume 567, Issue 2, pp. 1091-1101.

Astronomy and Astrophysics

Astronomy

10

Accretion, Accretion Disks, Stars: Individual (Cygnus X-2), Stars: Neutron, X-Rays: Binaries, X-Rays: General, X-Rays: Stars

Scientific paper

We report on a joint BeppoSAX/RXTE 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 hr 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 quasi-periodic 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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