Mass-loss rates for IRAS-bright red giants - A revised model of circumstellar CO emission

Details Mass-loss rates for IRAS-bright red giants - A revised model of circumstellar CO emission Mass-loss rates for IRAS-bright red giants - A revised model of circumstellar CO emission

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..337k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 337-352.

Astronomy and Astrophysics

Astronomy

72

Infrared Astronomy Satellite, Red Giant Stars, Stellar Envelopes, Carbon Monoxide, Carbon Stars, Microwave Spectra, Rotational Spectra

Scientific paper

A model is presented for circumstellar envelopes in which the gas kinetic temperature is computed from the local envelope physical conditions. In regimes of large mass-loss rate regimes the line intensities are sharply decreased relative to the standard model due to the close coupling of the gas excitation temperature to kinetic temperature at high density. In these regimes, it is found that the predicted intensities are very sensitive to poorly determined properties of the envelope such as gas-to-dust ratio and dust emissivity. The model is applied to estimate the mass-loss rates of the well-studied carbon stars IRC +10216 and CIT 6 and the heavily obscured OH/IR star RAFGL 5379.

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