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Long-Term Brightness Changes in Cool Pulsating Variables

Published online by Cambridge University Press:  15 February 2018

John R. Percy
John R. Percy*
Affiliation:
Erindale Campus, University of Toronto, Mississauga, Ontario, Canada L5L 1C6

Abstract

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Several types of cool pulsating variables show unexplained long-term changes in brightness, typically on time scales of 10 to 20 times the basic (pulsational) period. The visual and photoelectric programs of the American Association of Variable Star Observers (AAVSO) are well-suited for detecting and studying these changes. Some examples are given here, including yellow hypergiants, RV Tauri stars, small- and large-amplitude red giant and super giant variables. The study of pulsating variables on long time scales provides “new perspectives” on their behavior.

Type
Windows on the Instability Strip
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 425 - 427
Copyright
Copyright © Cambridge University Press 1993

References

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