Photometry and period study of YY Geminorum

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A Stars, B Stars, Eclipsing Binary Stars, Light Curve, Orbit Calculation, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Periodic Variations

Scientific paper

Photoelectric observations were made with the 91-cm reflector at NASA's Goddard Space Flight Center in 1979. These show a second-order light variation superposed on the eclipse light curve, such that the maximum at phase 0.75 is brighter than that at phase 0.25 by about 0.06 in V light. The (B-V) color curve is about 0.08 redder at phase 0.0 than at phase 0.5. Two times of secondary minimum light and one time of primary were observed at the following heliocentric Julian Dates: 2443960.6731, 2443969.6277, and 2443949.679, respectively. An analysis of these and other recent timings indicate that the orbital period has remained constant between van Ghent's photographic observations in the 1920s and the present time. Implications of these observations are discussed.

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