Evidence for a 17-d periodicity from CYG X-3

Details Evidence for a 17-d periodicity from CYG X-3 Evidence for a 17-d periodicity from CYG X-3

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..592s&link_type=abstract

Nature, vol. 260, Apr. 15, 1976, p. 592-594.

Astronomy and Astrophysics

Astronomy

18

Binary Stars, Variable Stars, X Ray Sources, X Ray Spectra, X Ray Stars, Ariel Satellites, Black Body Radiation, Crab Nebula, Electron Scattering, Satellite Observation, Sky Surveys (Astronomy)

Scientific paper

Data are presented from the Ariel-V All-Sky Monitor which indicate a 17-day periodicity of the X-ray spectra from Cyg X-3 (3U2030+40). The data are consistent with data from the Ariel V Sky Survey Experiment. Assuming that the high intensity state of Cyg X-3 is well fitted by a structureless black body (Serlemitsos et al., 1975), and that the 17-day maxima correspond to increased electron scattering in the source, it is suggested that the 17-day effect is analogous to the 35-day variation in Her X-1. The possible explanation of this phenomenon as a result of the 17-day orbital period of the binary system containing Cyg X-3 is severely constrained by the stability of the well-known 4.8-hour variation.

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