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Longterm AAVSO Observations of the Symbiotic System Ch Cygni

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Margarita Karovska

Harvard-Smithsonian Center for Astrophysics (CfA), 60 Garden Street, Cambridge, MA 02138

Janet A. Mattei

AAVSO, 25 Birch Street, Cambridge, MA 02138

Received: August 21, 1992

Abstract

The 10-day means of AAVSO observations from 1948 to 1992 have ben analyzed for the symbiotic star CH Cygni, using the Horne-Baliunas period searching technique.  The data have been divided into 4 segments corresponding to quiescent or outburst phases of the system.  Several periods (738+-, 338+-, 155+-, 101+- days) are detected in each segment.  In addition periodicity of 17-years is detected in the Fourier transform of the entire data set.  The results of this study are compared with those obtained by other researchers using different data sets and or period-analysis techniques.