Search for the remnants of the 1977-1986 outburst in the quiescent phase of CH Cygni (CROSBI ID 95174)
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Jurdana, Rajka ; Kotnik-Karuza, Dubravka
engleski
Search for the remnants of the 1977-1986 outburst in the quiescent phase of CH Cygni
We present the results of spectroscopic measurements of line spectra of the symbiotic star CH Cygni in the optical region of the EM spectrum. The observations extend over a period of two years (1987-89) and cover the quiescent state of the star. Although in most spectra the flat transition part of the curve of growth was predominant, a refined fitting procedure made possible the evaluation of the excitation temperature and microturbulent velocity for neutral metals in the red giant's photosphere. A regular decrease of the excitation temperature within the same interval for the investigated elements has been found, with the exception of Fe I for which the temperatures are higher. The microturbulent velocities show small erratic variations around a mean value, which is greater for Fe I than for the other elements. This could be explained by a stratification in the photosphere of the cool component.
stars:CH Cyg - binaries: symbiotics - stars:atmospheres
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