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The Changing Period of R Hya

Published online by Cambridge University Press:  26 May 2016

Albert A. Zijlstra  and
Timothy R. Bedding
Albert A. Zijlstra
Affiliation:
UMIST, Department of Physics, P.0. Box 88, Manchester, UK
Timothy R. Bedding
Affiliation:
University of Sydney, School of Physics, Sydney, NSW 2006, Australia

Abstract

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We discuss the period evolution of the Mira variable R Hya. We show, using observations dating back to 1662, that it has evolved from a stable 500-day period to a stable 380-day period. The onset of the period evolution coincided with a sharp decline in mass-loss rate. We suggest that mass-loss fluctuations over a period of a few hundred years may be common in Miras, and relate to a non-linear pulsation instability.

Type
Part III: Planetary Nebulae in the Scheme of Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 89 - 90
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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