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eJAAVSO

Secular Evolution in Z Tauri

 

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Aaron Price

AAVSO, 25 Birch Street, Cambridge, MA 02138

 

Geir Klingenberg

Norwegian Astronomical Society, Engeshaugen 15 N-8616 Baasmoen, Norway

 

Received December 10, 2004; revised April 19, 2005; accepted April 22, 2005

 

Abstract  Z Tauri is a Mira variable with observations in the AAVSO International Database dating back 85 years. Wavelet analysis of the observations reveals a period decline of around 13% from 500 days to 442 days per cycle. In addition, flat minima suggest the possible presence of an undetected companion.

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