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eJAAVSO

Period Analysis of the Light Curves of Three Semiregular Variables: AA Cygni, U Delphini, and RX Bootis

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Jerzy Speil
Zamek Ksiqz, 58-306 Walbrzych, Poland

Abstract
New visual observations confirm the presence of the ~210-day period in the light curve of AA Cyg, and the ~1150-day period in U Del. RX Boo exhibits double periodicity, with periods of 160 and 278 days, present since 1991. Clearly, RX Boo is a new member of the small group of double-mode red giants.

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