Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.131..781k&link_type=abstract
(IAU, Colloquium on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 93rd, Bamberg, West
Astronomy and Astrophysics
Astrophysics
10
Emission Spectra, Line Spectra, Planetary Nebulae, Stellar Evolution, Symbiotic Stars, Visible Spectrum, Absorption Spectra, Hot Stars, Interstellar Extinction, Mass Distribution, Stellar Mass Ejection, Stellar Spectrophotometry
Scientific paper
Optical spectra of AS 201, obtained with the 1.5-m La Silla ESO telescope in 1983, show the emission lines of moderate (class 5) excitation and absorption spectrum of a G2 III star. Values of 0.45 for the interstellar extinction, and 1.5 kpc for the distance, are derived. The hot components of this symbiotic star, Cn 1-1 and M 1-2, are shown to be located on the Harman-Seaton sequence in the region of evolved central stars of planetary nebulae (PN). It is suggested that the hot components of some SS may be evolved nuclei of PN, and that the high electron density of their nebulae may be due to mass loss from the respective cool stars of the binaries.
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