Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132...37e&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 37-44. Research supported by the Naturvetenskapliga
Astronomy and Astrophysics
Astrophysics
56
Carbon Stars, Hydrocyanic Acid, Molecular Absorption, Opacity, Stellar Atmospheres, Stellar Spectra, Absorption Cross Sections, Infrared Absorption, Polyatomic Molecules, Stellar Models, Stellar Temperature
Scientific paper
Existing model atmospheres for carbon stars as well as observations indicate that some polyatomic molecules may be important opacity sources in at least the cooler carbon stars. In order to investigate the importance of the absorption from HCN, which seems to be one of the most important polyatomic opacity sources, monochromatic absorption cross sections have been calculated at a great number of wavelengths for this molecule. These calculations have been based on the assumption that the ratios between the transition probabilities of the combination transitions relative to the fundamentals follow rules, deduced empirically for other molecules. Opacity distribution functions were calculated and model atmospheres including the HCN opacity were constructed. The effects of HCN on the models turned out to be remarkably great.
Eriksson Kimmo
Gustafsson Bengt
Jorgensen Uffae G.
Nordlund Aake
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