Studies of Mira and Semiregular Variables Using Visual Databases
T. R. Bedding, Blair C. Conn, Albert A. Zijlstra · International Astronomical Union Colloquium · 2000
Abstract We used wavelets to investigate period and amplitude changes in Mira and semiregular variables and found a variety of behaviours. Period and amplitude changes often go together, perhaps because changes in amplitude are causing period changes via nonlinear effects.