The Symbiotic Star CI Cygni

Volume 10 number 2 (1981)

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Janet A. Mattei

AAVSO

Abstract

The spectroscopic and optical characteristics of symbiotic stars are summarized. Long-term visual (AAVSO) and photographic behavior of the symbiotic star, CI Cygni, is discussed. The visual and the three color (blue, red, and yellow) photographic light curves are all in phase. They are suggestive of both eclipsing binary and eruptive type variations, with eclipses occuring 855 days apart, and eruptions occuring direclty after each eclipse. The eruptions may be phase dependent.