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Optical spectroscopy and modelling of the symbiotic star CH Cygni in the quiet phase

This paper contributes to the ongoing discussion on the nature of the extraordinary star CH Cygni. A rwview of our observations of optical spectra of CH Cyg in its inactive period 1987-89 is given. The results are discussed in view of the existing models which are based mainly on observations of the star during outbursts. We have suggested a picture acceptable to explain at least the phenomena connected with quiescence and pointed out the importance of continuous monitoring of this star system also in the quiescent phases for the construction of a generally valid model.

symbiotic stars; spectroscopic and photometric variability; inactive phases

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