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Superorbital variability of X-ray and radio emission of Cyg X-1 – I. Emission anisotropy of precessing sources
We study theoretical interpretations of the ∼150-d (superorbital) modulation observed in X-ray and radio emission of Cyg X-1 in the framework of models connecting this phenomenon to precession. Precession changes the orientation of the emission source (either disc or jet) relative to the observer. This leads to emission modulation due …