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Session 59 - Pulsating/Variable Stars.
Display session, Wednesday, June 12
Great Hall,
The brightness variations of the semiregular variable RV And have been monitored for about 12 years at Grinnell College's Grant O. Gale Observatory as part of a project designed to investigate the mode of pulsation for this class of stars. In the early 1980's the Fourier spectrum of the light curve had only one strong frequency component, but following an apparent mode change in 1986 the Fourier spectrum became more complex, suggesting simultaneous pulsation in two or more modes. Since that time both the strengths and the frequencies of these components have been variable, although there has been a trend back toward a simpler Fourier spectrum. The behavior of the frequency components suggests that the oscillations of these stars may involve complex interactions among several modes of pulsation.
