Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..596c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 596-606. Research supported by NASA and University of
Astronomy and Astrophysics
Astrophysics
15
Exosat Satellite, Line Spectra, Satellite Observation, Satellite-Borne Instruments, Variable Stars, X Ray Binaries, Bremsstrahlung, Data Reduction, Iue, Light Curve, X Ray Telescopes
Scientific paper
An analysis of five Exosat observations of Cyg X-2, taken around a full binary orbit is presented. The data were obtained using all instrumentation (1000 lines/mm Transmission Grating Spectrometer, Channel Multiplier Array + filters, Medium-Energy experiment, and Gas Scintillation Proportional Counter) simultaneously, and span the full energy range 0.5-20 keV. No clear evidence was found for a correlation of any of the source characteristics with orbital phase. During two of the observations, significant iron K emission at 6.7 keV was detected, the relative strength of which seems to correlate with total X-ray intensity during two sharp intensity dips. The previous detection of discrete emission features in the 12-19 A band with the Einstein grating is confirmed.
Branduardi-Raymont Graziella
Chiapi A. L.
Chiappetti Lucio
Ercan Nihal E.
Freeman Peter E.
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