Abstract
ABSTRACT Sixteen new timings of the eclipses of the cataclysmic variable DQ Herculis are reported. Nine of the timings were obtained in 1979 using the 1.2-m Newtonian focus telescope at the Cloudcroft Observatory, and the remainder were obtained in 1976 with the Prairie Observatory 1.0-m reflector. Times of minima determined from the present observations together with those obtained previously were then fit to both linear and parabolic ephemerides, and the linear fit was found to be more satisfactory. Times of minima calculated according to the linear ephemeris fit differ from the observed times in a manner indicating a sinusoidal variation in orbital period, the cause for which is unknown.
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