Long-term observations of Cyg X-3 with Vela 5B [electronic resource].
- Los Alamos, N.M. : Los Alamos National Laboratory, 1984.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 8 : digital, PDF file
- Additional Creators:
- Los Alamos National Laboratory
United States. Department of Energy. Office of Scientific and Technical Information
- We present long-term (1969 to 1979) observations of Cygnus X-3, obtained by the Vela 5B satellite. The 3 to 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 10/sup 16/ eV. It has a 4.8 hour period, probably orbital, which is not resolved by our present analysis. Long-term periodicities of approx. 17, 20, and 33 to 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 approx. 17 and 33 to 34 day variations, and set upper limits significantly lower than the reported amplitude of the 33 to 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 approx. 1 year. There is no counterpart, at this time resolution, of the giant radio outburst of September 1972. 8 references, 4 figures.
- Published through SciTech Connect.
18. ESLAB symposium on x-ray astronomy, Hague, Netherlands, 5 Nov 1984.
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