Observations of the Symbiotic System Ch Cygni
for Astrophysics (CfA), 60 Garden Street, Cambridge, MA 02138
Janet A. Mattei
AAVSO, 25 Birch Street, Cambridge, MA 02138
Received: August 21,
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.