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

Volume 35 number 1 (2007)

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J. Speil

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.