Amorphous carbon around carbon stars

Details Amorphous carbon around carbon stars Amorphous carbon around carbon stars

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138..127o&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 1, Nov. 1987, p. 127-140. Research supported by the Ministero del

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Amorphous Materials, Carbon Stars, Cool Stars, Cosmic Dust, Stellar Envelopes, Stellar Luminosity, Computational Astrophysics, Interstellar Matter, Late Stars

Scientific paper

In this paper, the results of a simplified model to determine the flux emerging from dust envelopes around cool stars are presented. The model proposed holds under the hypotheses of negligible scattering effects and spherical geometry of the dust cloud. The aim of this work is to compare the effects of a graphitic or amorphous composition of the carbon grains in the envelopes. Experimental extinction data obtained in the laboratory for submicron amorphous carbon particles are used. The model has been used to fit the FIR spectral trend of 78 optically thin sources and to reproduce the full spectra of two of the most IR luminous optically-thick sources: CIT 6 and IRC + 10216. The calculations indicate clearly that solid carbon particles around these sources may be amorphous rather than crystalline.

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