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Emission lines in the optical spectra of CH Cygni 1991-95.

This paper deals with the interpretation of part of a long-term observation of the symbiotic star CH Cygni performed at Haute Provence Observatory from January 1990 until March 1995. The work covers four different dates belonging to the active phase of the star from its beginning in 1991 to the decline in 1995. The H gamma and H delta Balmer emission lines were measures together with the lambda 4471 He I, lambda 4363 [O III], lambda 4233 Fe II and lambda 4243 [FeII] lines. The results were considered in the context of the data published for this period and compared with observations in other active and inactive phases. Conclusions about the physical conditions in the line-emitting region have been deduced without supporting a unique model of the star.

symbiotic star; spectral observations; emission lines; CH Cyg

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