Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ncimc..13..453m&link_type=abstract
Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 13 C, Mar.-Apr. 1990, p. 453-462.
Other
4
Cygnus Constellation, X Ray Sources, Annual Variations, Light Curve
Scientific paper
Cygnus X-3 has been observed from 1982 to 1987 at primary energy of 10 to the 14th eV from the Plateau Rosa array. The absolute excess in the counting rate from the source region amounts to 0.15 percent, mostly concentrated in 1982 and 1986. The effect is observed in two classes of events although with small significance (2 and 1.4 s.d.). The 1986 data are consistent with observations of other arrays. The study of the 4.4h time periodicity over a long observation time does not show any significant structure (2.5 s.d. excess at phase 0.2-0.5). In 1982 and 1986 the light curves show respectively a wide excess between phases 0.60 and 0.85 and a 2.7 s.d. excess at phase 0.2-0.25. The analysis of daily excesses from the source shows a good agreement with the expectations from pure statistical fluctuations, and no significant evidence of burst activity.
Morello C.
Navarra Gianni
Periale L.
Vallania Piero
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