Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..886p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 886-893. DOE-sponsored research.
Astronomy and Astrophysics
Astronomy
18
Spaceborne Astronomy, Stellar Spectrophotometry, X Ray Binaries, Accretion Disks, Fourier Transformation, Radiant Flux Density, Spectrum Analysis, Stellar Coronas, Stellar Luminosity, Tables (Data), Vela Satellites
Scientific paper
The authors present long-term (1969 - 1979) observations of Cygnus X-3, obtained by the Vela 5B satellite at 3 - 12 keV, with 10d time resolution. The object has a 4.8 hr period which is thought to be orbital. Long-term periodicities of 17d, 20d, and 33d - 34d have been reported by several authors. The authors of this paper do not observe the 17d and 33d - 34d variations, and set upper limits significantly lower than the reported amplitude of the 33d - 34d variation. The 4.8 hr variation is evident in the data, appearing with the doubly aliased period of 20d.1. The nonperiodic longer fluctuations in the X-ray intensity of Cyg X-3 are suggestive of randomly occurring ≡100d outbursts (shot noise).
Priedhorsky William
Terrell James
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