Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258...95s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 95-102.
Astronomy and Astrophysics
Astronomy
22
Abundance, Carbon, Carbon Isotopes, Infrared Spectroscopy, Stellar Spectrophotometry, Symbiotic Stars, Absorption Spectra, Carbon Monoxide, Emission Spectra, Red Giant Stars
Scientific paper
Intermediate-resolution spectra of a sample of symbiotic stars in the K and L bands are obtained. Pfund and Brackett emission lines as well as the first-overtone CO absorption bands are detected. Synthetic spectra are used to fit the CO absorption features and to obtain carbon abundances and C-12/C-13 ratios. Subsolar carbon abundances are found in the symbiotic red giants with little scatter from star to star. The C-12/C-13 ratios are also lower than the solar value. No modifications due to binarity are detected. The synthetic spectra were used to obtain angular diameters for some of the symbiotic red giants. A modified scheme applicable to symbiotic stars is given which enables accurate spectral classification of red giants embedded in strong nebular emission.
Boyle Stephen J.
Schild Hans
Schmid Hans Martin
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