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Evidence for a 17-d periodicity from Cyg X-3 (1976)

Holt, S. S. ; Pounds, K. A. ; Peacock, A. ; [et al.]

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Publication Date: 2011-08-16

Description: 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.

Keywords: ASTROPHYSICS

Type: Nature; 260; Apr. 15

Format: text

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