Model for Cygnus X-3

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Scientific paper

CYGNUS X-3 has been identified1 with the infrared object found by Becklin et al.2 to be within +/-2'' of the radio position: the infrared object is found to vary in intensity with the same period as and in phase with the X-ray object. The infrared flux (2.2 µm) varies smoothly by about 15% whereas the X-ray intensity varies by a factor ~3. Cyg X-3 is unique among other regularly varying sources in that the X-ray light curve is smooth and roughly sinusoidal3, displaying no sudden intensity variations indicative of an eclipse of a compact X-ray source by a larger object (for example, a companion star). We show that nevertheless Cyg X-3 can be interpreted by means of the `standard model' for galactic X-ray sources in terms of mass loss from a large companion star and accretion onto a compact object.

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