Hard X-ray observations of Cygnus X-3

Details Hard X-ray observations of Cygnus X-3 Hard X-ray observations of Cygnus X-3

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..127r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 127-130.

Astronomy and Astrophysics

Astronomy

22

Stellar Spectra, X Ray Astronomy, X Ray Binaries, Accretion Disks, Astronomical Models, Light Curve, Stellar Oscillations, X Ray Spectra, X Ray Telescopes

Scientific paper

This paper presents the hard X-ray observations of Cyg X-3 obtained using a large area proportional counter telescope, flown on a balloon on March 18, 1986. The source was observed for a duration of about 2 h spanning the 4.8 h binary cycle. The integral intensity of the source in the 20-100 keV range shows a strong 4.8 h modulation with a broad maximum between the binary phases 0.3 and 0.7. The observed photon flux during the maximum intensity is well fitted with a power law spectrum of index of 2.8 + or - 0.5. Fourier analysis of data obtained during the maximum intensity shows a periodicity at 121 s, which is attributed to transient oscillations of the type seen at the lower energies.

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