Frequency Analysis of Long-term AAVSO Visual Observations of TU Cas

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Shawn Dvorak

Rolling Hills Observatory, 1643 Nightfall Drive, Clermont FL 34711

Received June 11, 2008; revised August 14, 2008; accepted August 29, 2008

Abstract
Forty years of visual data in the AAVSO International Database for the double-mode Cepheid variable TU Cas were analyzed for possible changes in pulsation frequency and amplitude. The data were divided into four epochs for frequency analysis to search for any changes in the pulsation periods. The fundamental and first-overtone periods showed no significant variation during the forty-year span. The values determined for these frequencies agree well with other studies based on PMT and CCD data.