Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.102..123r&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 102, no. 1, July 1984, p. 123-129.
Astronomy and Astrophysics
Astrophysics
3
Metallicity, Stellar Composition, Stellar Envelopes, Stellar Spectra, Symbiotic Stars, Absorption Spectra, Electron Density (Concentration), H Lines, Spectral Line Width, Spectrum Analysis, Stellar Activity
Scientific paper
Sometimes CH Cyg is classified as a symbiotic star. However, it differs from a typical star of that type, because its spectrum does not show emission lines of sufficiently high excitation and there are no signs of orbital motion which would indicate the binary nature of the star. Spectral changes in CH Cyg were discovered, and the presence of rather strong hydrogen emission lines was detected. It has not yet been possible to provide a model which can explain satisfactorily all the essential phenomena occurring in the star. A description is presented of spectral observations of CH Cyg which began in 1974. The shell absorption lines of metals in the spectrum of CH Cyg are listed in a table. An analysis of the absorption spectrum was performed with the aid of the curve-of-growth method.
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