Amorphous carbon and silicon carbide grain mixtures in the envelopes of carbon stars

Details Amorphous carbon and silicon carbide grain mixtures in the envelopes of carbon stars Amorphous carbon and silicon carbide grain mixtures in the envelopes of carbon stars

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..561b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 2, p. 561-566

Physics

21

Amorphous Materials, Carbon, Carbon Stars, Cosmic Dust, Granular Materials, Infrared Stars, Silicon Carbides, Stellar Envelopes, Stellar Models, Stellar Physics, Abundance, Crystallinity, Star Formation, Stellar Composition, Stellar Evolution

Scientific paper

By using a theoretical model and laboratory data on different granular dust mixtures containing amorphous carbon and silicon carbide (of both crystalline forms alpha-SiC and beta-SiC) we fit the spectra of a set of carbon stars observed by IRAS and showing the 11.3 micron emission feature. The results evidence that, in order to obtain good fits for the various sources, different dust mixtures are needed. All of them require both amorphous carbon, which takes into account the continuum, and alpha-SiC responsible for the emission band but in some sources the presence of beta-SiC is also needed. A relevant consequence of this study is that we find differences in the relative abundance of the two SiC components and this can be important in tracing the evolutionary sequence of carbon stars since the production of alpha-SiC and beta-SiC in the dust envelopes are linked to the thermal history of the grains during the formation processes.

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