The Light Curve of CI Cygni 1967-1992

Volume 21 number 2 (1992)

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S. Tania Ruiz

Maria Mitchell Observatory, 3 Vestal Street, Nantucket, MA 02554

Abstract

The light curves of the symbiotic variable star CI Cygni are presented for the years 1967 through 1992. The data are from the plate collection of the Maria Mitchell Observatory (MMO) and from the visual observers of the AAVSO. Previously unpublished MMO data of CI Cygni are included for the era between 1967 and 1981. The light curve suggests the system experienced an approximately 5-year interval of nova-like outbursts which was preceded and followed by two-and-a-half decades or more of relative quiescence.