Other
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apjs...29..123j&link_type=abstract
Astrophysical Journal Supplement Series (Supplement no. 280), vol. 29, Apr. 1975, p. 123-136.
Other
27
Astronomical Models, Atmospheric Density, Atmospheric Models, Late Stars, Nuclear Fusion, Stellar Atmospheres, Abundance, Hydroxyl Compounds, Silicon Carbides, Spectrum Analysis, Stellar Luminosity, Stellar Spectra
Scientific paper
Molecular column densities are presented for 35 molecules in a variety of cool stellar model atmospheres. From an examination of the predicted column densities, we draw the following conclusions: (1) OH might be visible in carbon stars which have been generated from triplet-alpha burning, but will be absent from carbon stars generated from the CNO bi-cycle; (2) the TiO/ZrO ratio shows small but interesting variations as C/O is changed and as the effective temperature is changed; (3) the column density of silicon dicarbide (SiC2) is sensitive to abundance, temperature, and gravity; hence, all relationships between the strength of SiC2 and other stellar parameters will show appreciable scatter. There is, however, a substantial luminosity effect present in the SiC2 column densities; (4) unexpectedly, SiC2 is anticorrelated with C2; (5) the presence of SiC2 in a carbon star allows us to eliminate the possibility that these stars are both 'hot' (Teff greater than or equal to 3000 K) and have been produced through the CNO bi-cycle (so that C/H is less than solar).
Beebe Reta F.
Johnson Hollis R.
Sneden Chistopher
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