Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..131h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 131-146.
Astronomy and Astrophysics
Astronomy
136
Astronomical Spectroscopy, Ginga Satellite, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, Cygnus Constellation, Japanese Spacecraft, Spaceborne Astronomy, Stellar Oscillations, X Ray Spectra
Scientific paper
X-ray observations of Cyg X-2, obtained with the Ginga satellite on 6 days in June and October 1988, are reported and analyzed with reference to data from simultaneous UV and radio observations. The instrumentation and data-reduction procedures are described, and the results are presented in extensive tables and graphs and characterized in detail. The horizontal, normal, and flaring branches of the Z-shaped correlation curve in the X-ray color-color diagram are all observed over a period of about 2 days, with (1) a faint extension of the 55-Hz quasi-periodic oscillation (QPO) into the upper normal branch, (2) a significant increase in the frequency of the 5-Hz QPO down the normal branch and into the lower flaring branch, and (3) a twofold increase in the X-ray and UV flux from the horizontal to the flaring branch (indicating an increase in the accretion rate).
Dotani Tadayasu
Ebisawa Ken
Hasinger Guenter
Mitsuda Kazu
van der Klis Michael
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