Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..299j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 1, 1986, p. 299-304.
Astronomy and Astrophysics
Astrophysics
2
Atmospheric Models, Carbon Stars, Stellar Atmospheres, Carbon Monoxide, Cyanogen, Opacity, Optical Thickness, Stellar Temperature
Scientific paper
Model atmospheres designed to represent R stars are presented and discussed. These atmospheres are calculated with the usual assumptions of hydrostatic equilibrium, constancy of total (radiative plus convective) energy flux, and local thermodynamic equilibrium in a plane-parallel, horizontally homogeneous geometry. Blanketing due to atomic lines and molecular lines of CN, CO, C2, CH, NH, OH, and MgH is accounted for by opacity sampling. The thermal and pressure structures of these models are in excellent agreement with similar models computed with a different code and with opacity distribution functions. Molecular number densities and column densities are displayed. Predicted fluxes compare well with Wing-filter observations in the red and infrared but are too high in the visual and violet regions, probably because of insufficient opacity there.
Johnson Hollis R.
Yorka Sandra B.
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