A Period Study of the Eclipsing Binary GK Cephei

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Raymond D. Benge, Jr.

James A. Roberts

University of North Texas

Denton, Texas 76203-5368

Presented at the Spring Meeting of the AAVSO, May 21, 1994

Abstract

Several new determinations of times of minima based upon photoelectric measurements of the eclipsing binary GK Cephei are reported. These measurements, together with times of minima previously reported in the literature, permit an improvement to the ephemeris equation for GK Cep. Analysis of O-C residuals determined from linear ephemeris equations suggests a periodic oscillation with a period of 18.6 years. Inclusion of a sinusoidal term in the ephemeris equation with this period greatly improves the fit of the ephemeris equation with reported observations of times of minima.

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