Other
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...62..373l&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 62, Oct. 1986, p. 373-425. Research supported by the Robert A. We
Other
406
Carbon Stars, Cool Stars, Stellar Composition, Stellar Spectra, Astronomical Catalogs, Atmospheric Models, Carbon, Line Spectra, Metallicity, Nitrogen, Oxygen, Spectral Bands
Scientific paper
Chemical compositions of 30 Galactic carbon stars are determined from high-resolution infrared spectra and new model atmospheres. Elemental C, N, and O abundances are quite similar to those seen in planetary nebulae and are consistent with those reported for G to M giants. Carbon stars show only modest carbon enrichments: C/O is less than 1.6, and half the sample have C/O less than 1.1. The 12C/13C ratio is between 20 and 90 except for a few 13C-rich stars. When line blanketing by HCN and C2H2 is included, models predict the observed intensity of the H2 quadrupole lines. This and other evidence shows that the carbon stars are not hydrogen-deficient.
Eriksson Kjell
Gustafsson Bengt
Hinkle Kenneth H.
Lambert David L.
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