Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..823m&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 823-834.
Astronomy and Astrophysics
Astrophysics
82
Carbon Monoxide, Interstellar Masers, Stellar Envelopes, Stellar Evolution, Thermal Emission, Carbon Stars, Infrared Radiation, Radiative Transfer, Stellar Mass Ejection, Stellar Models
Scientific paper
Calculations performed for the coupled radiative transfer and statistical equilibrium of CO in spherically symmetric, expanding stellar envelopes are presented. The results were used to determine intensities of the rotational lines and the shapes of the emergent line profiles as measured by a telescope; the profiles and intensities are presented for a large range of mass loss rates, CO abundances, and infraradiation fields. It was found that cool, expanding, stellar envelopes fall into three categories based on the CO excitation: (1) optically thin, in which excitation is dominated by absorption and reemission of 4.6 micron photons; (2) optically thick, in which excitation is dominated by collisions with H2 molecules; and (3) a weak CO maser pumped by 4.6 micron photons.
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