Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134...24t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 1, May 1984, p. 24-30. Research supported by the Deutsche Forschungsg
Astronomy and Astrophysics
Astrophysics
14
Carbon Stars, Late Stars, Opacity, Polyatomic Molecules, Stellar Atmospheres, Absorption Cross Sections, Acetylene, Harmonic Oscillators, Hydrocyanic Acid, Line Spectra, Molecular Spectra, Stellar Models
Scientific paper
A band model method-based examination of the molecular opacities of polyatomic species in C-rich atmospheres has yielded results that are presently compared with results obtained by a simpler model that is based on rigid-rotator and harmonic oscillator approximations. While the detailed, band-by-band method offers a marked improvement over the rigid rotator-harmonic oscillator model, the latter is still useful in virtue of its simplicity and flexibility. This model is accordingly generalized to permit its application to not only parallel bands, but also perpendicular ones. Attention is given to the HCN and C2H2 molecules, and it is found that while these are important sources of opacity in the IR for C-rich atmospheres, their spectra are simple and therefore have a relatively modest effect on stellar opacity as a whole.
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