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We use observations of the Luminous Blue Variable (LBV) P Cygni spanningseven decades, along with signal processing methods, to identify a periodicityin the stellar luminosity. We find a distinct period of $4.7 \pm 0.3$ yearstogether with shorter periods. The periodicity is a possible indication of abinary companion passing in an eclipse-like event from the dense LBV wind, andif so it is the first observational indication that P Cygni is a binary system.This may support models that contribute giant LBV eruptions to interaction witha binary companion. We discuss other interpretations for the periodicity aswell.

Periodicity in the Light Curve of P Cygni - Indication for a Binary Companion?