Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159..117h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 117-128.
Astronomy and Astrophysics
Astrophysics
22
Binary Stars, Stellar Mass Ejection, Stellar Spectra, Ultraviolet Spectra, Visible Spectrum, Accretion Disks, Line Spectra, Red Giant Stars, Spectral Energy Distribution, Spectrum Analysis, Stellar Spectrophotometry, Stellar Winds, Symbiotic Stars
Scientific paper
The visual and UV spectroscopic observations of CH Cyg in November 1984 and January and May 1985 indicate that the outburst that started in 1977 has almost ended. The characteristics of the spectrum and its variations during these eight years of activity are described. The RV measurements strongly suggest that CH Cyg is a binary system, with P of about 13-16 yr, formed of the M 6 III primary and of a collapsed companion of about the same mass as the primary, surrounded by an accretion disk where the outbursts take place. Since the ratio of the distance between the two stars and the radius of the red giant is about 10, the accretion disk must be formed by mass lost from the primary by stellar wind. Evidence of mass loss is given by the resonance lines of Ca II and Mg II, by the recently observed IR excess and by the radio sources associated with CH Cyg.
Aydin Cemal
Engin Semanur
Hack Margherita
Rusconi L.
Sedmak Giorgio
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