Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..237r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 237-246.
Astronomy and Astrophysics
Astrophysics
4
Carbon Monoxide, Infrared Radiation, Molecular Spectra, Radiative Transfer, Red Giant Stars, Stellar Envelopes, Emission Spectra, Late Stars, Line Spectra, Stellar Mass Ejection
Scientific paper
This is the first in a series of papers which will describe calculations of molecular line emission and infrared continuum radiation from the expanding circumstellar envelopes of red giants that are undergoing rapid mass loss. This paper will be concerned primarily with CO line emission from the outer regions of these envelopes. The present method of solution requires the simultaneous solution of the radiative transfer equation for the CO emission lines, the equations of statistical equilibrium that determine the populations of the rotational levels of the CO molecule, and an energy equation, which determines the kinetic temperature distribution within the envelope if the level populations and radiation field are known. Expressions are derived for the heating rate caused by collisions between molecules and dust particles of cylindrical and spherical shape that drift through the gas as a result of radiation pressure. Solutions which were calculated for a range of physical input parameters are described and discussed. Finally, the present calculations are compared to observations of IRC + 10216, and refinements in the calculations that will be included in a subsequent paper are discussed.
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