Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..335m&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)335-(12)338
Astronomy and Astrophysics
Astronomy
1
Accretion Disks, Neutron Stars, Periodic Variations, Power Spectra, X Ray Astronomy, X Ray Binaries, X Ray Spectra, Balloon-Borne Instruments, Fourier Analysis, Light Curve, Proportional Counters, X Ray Telescopes
Scientific paper
Hard X-ray observations of Cyg X-3 in the energy range 20-100 keV were made with a Balloon-borne telescope using two large area proportional counters. The source was seen with a total significance of 20 sigma. A 121-s periodicity was seen during Fourier analysis of the data. The phenomenon can be interpreted as due to transient pulsation since no other peak was seen in our data. Quasi-periodic oscillation in the range 0.06-20 mHz have been observed from Cyg X-3 at lower energies. Interestingly, most of the reported periods are multiples of the present measurements. The observed pulsation at high energies indicates the occasional unstable behavior of the inner parts of the accretion disk connected with the basic rotation period of the compact object. The 4.8 hr modulation, characteristic of the orbital period of the binary system was seen in the data, with a broad maximum between the phase 0.3 to 0.7
Manchanda Ravi K.
Rao Ravi A.
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