Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87...88m&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 88-91. Research supported by the Comitato Regionale Siciliano per l
Astronomy and Astrophysics
Astronomy
22
Binary Stars, Periodic Variations, X Ray Sources, X Ray Spectra, Cos-B Satellite, Doppler Effect, Spaceborne Astronomy, Stellar Motions, Stellar Rotation, Time Dependence
Scientific paper
COS-B observations of a 34.1-day periodicity in the X-ray intensity of the X-ray source Cyg X-3 are discussed. Collimated proportional counter observations of the source were made in the 2-12 keV energy range for a total of approximately 100 days in three intervals of approximately one month each; data from two of these intervals allow the monitoring of long-term intensity variability. Counting rates averaged over each 4.8-h intensity cycle within the intervals are shown to exhibit an additional 34.1-day periodicity, the maximum time of which is in agreement with Ariel V data suggesting a 16.75-d periodicity. COS-B data support the hypothesis that the long-term periodicity is accounted for by orbital motion in a binary system with high eccentricity, with the 4.8-h modulation due to some rotational mechanism of the compact X-ray emitter. Finally, similarities between Cyg X-3 and the binary system Cir X-1 are pointed out.
Molteni Diego
Rapisarda Massimo
Robba Natale Renato
Scarsi Livio
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