Radiative Transfer in Dust Clouds - Part Four - Circumstellar Dust Shells around Carbon Stars

Details Radiative Transfer in Dust Clouds - Part Four - Circumstellar Dust Shells around Carbon Stars Radiative Transfer in Dust Clouds - Part Four - Circumstellar Dust Shells around Carbon Stars

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202..797r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 202, P. 797, 1983

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146

Scientific paper

The solution of the equation of radiative transfer developed by Rowan-Robinson is applied to a sample of 41 carbon stars and three others displaying similar characteristics. All of these have appreciable infrared excesses. The models, consisting of a star in a spherically symmetric circumstellar dust shell (CDS), are compared with the available observational data. All the CDS can be successfully modelled with an n(r)∝r-2 density distribution, consistent with steady outflow at a constant velocity. Amorphous carbon-type grains, having a QV∝V absorption efficiency, are found to model the sources with considerably more success than graphite grains, though it has also proved necessary to modify this somewhat at wavelengths λ ≲ 1.4μm in order to fit the shortest wavelength data where available. We adopt TS (temperature of central blackbody source) = 2500 K for stars of types C4 - C6 and 2000 K for C7 - C9.
In particular we compare our model of IRC + 10216 with the available infrared size measurements and with the models of other authors.

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