Abstract
ABSTRACT A study of the O-C diagrams of FN Aql and RX Aur revealed sinusoidal variations in the pulsation period of both Cepheids. An interpretation in terms of the binary nature of these variable stars is suggested because both stars have an unusual color index that may be caused by an unresolved companion. The orbital period and some other parameters are determined. Radial-velocity studies are strongly recommended in order to get decisive information on the existence of the companion.
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