Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...94..251k&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 94, no. 2, Aug. 1992, p. 251-258.
Astronomy and Astrophysics
Astrophysics
7
Binary Stars, Radial Velocity, Stellar Spectrophotometry, Symbiotic Stars, Visible Spectrum, Balmer Series, Calcium, Iron, Line Spectra, Photosphere, Potassium, Stellar Envelopes
Scientific paper
The optical spectrum of the symbiotic star CH Cygni has been investigated during the period 1987-1989 following the end of the long lasting outburst of 1977-1986. The measurements of the radial velocities of the unblended spectral lines have shown that the envelope is still expanding, that the absorption lines of both neutral and once ionized elements are formed in the photosphere of the M6 III star, and that the emission lines including the Balmer lines, some forbidden lines and permitted Fe II lines show radial velocities roughly opposite in phase with respect to the photospheric ones, as they did during the previous outbursts; therefore they can be associated with the companion. The complete disappearance of the blue continuum has been proved. The two absorption components of the Ca II H and K lines show about the same radial velocities as during the last outburst indicating the presence of two expanding almost permanent envelopes.
Hack Margherita
Jurdana R.
Kotnik-Karuza Dubravka
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