Physics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..305p&link_type=abstract
Space Science Reviews, Volume 40, Issue 1-2, pp. 305-311
Physics
3
Scientific paper
We present long-term (1969 1979) observations of Cygnus X-3, obtained by the Vela 5B satellite. The 3 12 keV light curve has 10 day time resolution. Cyg X-3 is a peculiar high-luminosity X-ray source, radiating from the radio region to hard gamma rays of more than 1016 eV. It has a 4.8 hour period, probably orbital, which is not resolved by our present analysis. Long term periodicities of ˜17, 20, and 33 34 days have been reported by several authors, and explained as the effects of apsidal motion, precession, or an eccentric orbit. We do not observe the ˜17 and 33 34 day variations, and set upper limits significantly lower than the reported amplitude of the 33 34 day variation. There is weak evidence for a 20 day flux variation. The light curve shows high and low states which alternate with a characteristic timescale of ˜1 year. There is no counterpart, at this time resolution, of the giant radio outburst of 1972 September.
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