Other
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332.1009h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 1009-1018.
Other
70
Carbon Monoxide, Line Spectra, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection, Supergiant Stars, Carbon Stars, Interstellar Matter, Planetary Nebulae, Radiation Distribution
Scientific paper
New observations are reported of the J = 1-0 and J = 2-1 lines of CO in the envelope of IRC +10216. CO is detected out to about 200 sec from the star. For an assumed distance of 200 pc, the radius of the CO envelope is 6 x 10 to the 17th cm, and the time scale for intense mass loss is at least 14,000 yr. The observed CO line widths decrease in the outer envelope as expected for a radially expanding wind. Thermal models of the gas yield temperatures and CO densities for the inner envelope similar to those found earlier by Kwan and Linke (1982). The simplest models, however, underestimate the CO emission in the outer envelope. One possibility discussed is the effect of the interstellar radiation field, which can raise the kinetic temperature of the outer envelope and photodissociate CO at a characteristic radius similar to that of the observed CO source. A model including both these effects is in reasonable agreement with the observations. Other possibilities which may affect the CO emission are also discussed.
Huggins Patrick J.
Johansson Lars E. B.
Olofsson Hans
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