Short-Period Light Variation of an Eclipsing Binary System: RZ Cassiopeiae
The Astronomical Journal2001Vol. 122(1), pp. 418–424
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O. Ohshima, S. Narusawa, Hidehiko Akazawa, K. Arai, M. Fujii, Tetsuya Kawabata, Koichi Morikawa, Nobuo Ohkura, M. Takeuti
Abstract
The eclipsing binary system RZ Cas is known to exhibit variation in its light curves at the primary minimum, usually showing a partial-eclipse–type curve but sometimes indicating a flat minimum, which is evidence for a total eclipse. We observed RZ Cas not only during the primary eclipse, but also during the out-of-eclipse phase, and we have found a short-period light variation with a frequency of 62.20 cycles day-1 (period of 23.15 minutes), whose maximum amplitude is 0.02 mag. This short-period variation can modulate the shape of the light curve at the primary minimum effectively. The brightness-color relationship of the short-period variation suggests a δ Scuti type oscillation.
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