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..592h&link_type=abstract

Nature, Volume 260, Issue 5552, pp. 592-594 (1976).

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Scientific paper

Cyg X-3 (3U2030+40) has exhibited phenomena which are observationally unique among identified X-ray sources. The giant radio flare of 1972 is, perhaps, the most spectacular such anomaly, but there are others no less unusual. A wide variation in X-ray spectra has been observed, including the identification of X-ray emission lines at some times, and consistency with a black body at others1. The approximately sinusoidal 4.8-h variation2 is at a period far in excess of any rotation period which has been ascribed to the compact members of other binary sources, and at least four times shorter than any comparable orbital period. Models have been constructed which identify the 4.8-h variation with orbital period3-5, acknowledging the peculiar geometries which could give rise to a smooth 4.8-h effect in observed X rays. We here present data indicating that a much longer periodicity of ~17 d is also characteristic of Cyg X-3.

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