Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..254j&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 1, 1982, p. 254-271.
Astronomy and Astrophysics
Astrophysics
60
Carbon Stars, Carbon 12, Isotopic Enrichment, Red Giant Stars, Stellar Atmospheres, Stellar Models, Abundance, Atmospheric Models, Atomic Spectra, Molecular Spectra, Opacity, Stellar Gravitation, Stellar Spectra, Stellar Temperature, Turbulence Effects
Scientific paper
A series of model stellar atmospheres, for both solar-like and carbon-enriched compositions, based on the standard assumptions of LTE, flux consistancy, and hydrostatic equilibrium in a plane-parallel geometry, are calculated. Also included are the usual hydrogenic opacities, and many lines of the molecules CN, CO, C2, TiO, NH, OH, and MgH, as well as atomic lines, that are treated by the opacity sampling method. For three series of models each with log g = 0.0 and having T(eff) = 2500, 3000, and 3500 K, the carbon abundances in the atmosphere is varied to produce C/O ratios ranging from 0.60 (solar) to -2.00. Results show that compared to an M star atmosphere, opacity is lower in the model with C/O = 1.00, for which value the model resembles an atmosphere based on continuous opacities alone, whereas the opacity in a C star is greater than an M star. In addition, the influence of changes in turbulent pressure and surface gravity is examined.
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