Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..630r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 15, 1985, p. 630-633.
Astronomy and Astrophysics
Astrophysics
16
Carbon Stars, Far Infrared Radiation, Infrared Spectra, Late Stars, Stellar Spectrophotometry, Variable Stars, Interstellar Matter, Radiant Flux Density, Spectrum Analysis, Stellar Envelopes, Stellar Mass Ejection, Stellar Models
Scientific paper
Far-infrared observations of IRC + 10216 in the wavelength range 20-160 microns are presented. The observations were performed simultaneously in four bands with effective wavelengths of 21, 42, 73, and 135 microns, respectively. The scan profile across the source at 21 microns is found to be wider than that for a point source. Interpreting the far-infrared spectrum on the basis of a model in which circumstellar grains are heated by a central source, the radial density dependence is r exp -2, and the emissivity dependence is lambda exp -n, it is found that n = 1-1.2. Time variations of a smaller magnitude at longer wavelengths as compared to the variation at near-infrared wavelengths can also be understood on the basis of this model. Using the mass-loss rate derived from CO observations, the mass absorption coefficient of the grains at 100 microns is found to be not less than 40/sq cm g.
Fazio Giacomo
Maxson C. W.
McBreen Brian
Rengarajan T. N.
Sciortino Salvatore
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