Photoelectric light curve and period study for RZ Draconis

Astronomy and Astrophysics – Astronomy

Scientific paper

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B Stars, Eclipsing Binary Stars, Light Curve, Stellar Spectrophotometry, Brightness, Electrophotometry, Hertzsprung-Russell Diagram

Scientific paper

Photoelectric observations in V and B are presented. The magnitudes and color indices at the four phases of principal interest are V = 11m.01, (B-V) = 0m.31 at phase 0.0; V = 10m.14, (B-V) = 0m.25 at phase 0.25; V = 10m.38, (B-V) = 0m.25 at phase 0.5; and V = 10m.14, (B-V) = 0m.24 at phase 0.75.
The (0- C) diagram indicates that the orbital period was constant from the time of the star's discovery as a variable in 1907 until about 1968. At that time the period suddenly decreased by about 2.9 × 10-6 days.
The current period is 0d.95508738, and the time of minimum derived from the observations in this paper is JD (hel.) 2444177.5555.

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