Multifrequency observations of CYG X-2: X ray observations with GINGA

Details Multifrequency observations of CYG X-2: X ray observations with GINGA Multifrequency observations of CYG X-2: X ray observations with GINGA

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...9024192h&link_type=abstract

In its Observations of Cygnus X-2 at X Ray, UV, Optical and Radio Frequencies p 1-45 (SEE N90-24191 17-89)

Physics

Binary Stars, Color-Color Diagram, Ginga Satellite, Satellite Imagery, Stellar Spectra, X Ray Spectra, X Ray Stars, Cygnus Constellation, Japanese Space Program, Stellar Flares, Stellar Magnetospheres, Stellar Oscillations, Ultraviolet Spectra, Visible Spectrum

Scientific paper

The observations of the bright low-mass x ray binary and Z-source Cyg X-2, carried out with the Japanese x ray satellite Ginga, are reported. The observations were effectuated for six days in 1988 June and October at x ray, ultraviolet, optical and radio wavelengths. On both occasions all three spectral states, the horizontal, normal and flaring branch, showing up as a Z-shaped correlation curve in an x ray color-color diagram, were observed. Quasi-Periodic Oscillations (QPO) and noise are detected. The sudden disappearance of the radio flares, hand in hand with the decrease of QPO and noise power and the softening of the x ray spectra at the transition from horizontal branch to normal branch can be interpreted in terms of a sudden inflation of the inner disk, which engulfs the entire magnetosphere in the normal branch.

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