An analysis of the emission features of the IRAS low-resolution spectra of carbon stars

Details An analysis of the emission features of the IRAS low-resolution spectra of carbon stars An analysis of the emission features of the IRAS low-resolution spectra of carbon stars

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..271b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 271-279.

Astronomy and Astrophysics

Astronomy

60

Carbon Stars, Emission Spectra, Infrared Astronomy Satellite, Infrared Spectra, Color-Color Diagram, Interstellar Matter, Silicon Carbides, Stellar Envelopes

Scientific paper

The Low-Resolution Spectra (LRS) data in class 4n reveal a considerable wealth of features and a remarkable variety of behaviours of the mid-IR spectra of C-stars. The main thrust of this work is on the SiC feature at 11.3 μm, whose shape and intensity were studied in detail. The feature becomes stronger and narrower as the temperature of the underlying continuum increases. The narrowest features are quite similar in shape to the mass absorption spectrum of laboratory α-SiC. A new weak feature at 11.7 μm may be due to solid SiC2 or a-C:H. When the whole range (8 - 23 μm) of the LRS is considered, evidence is found for crystalline as well as amorphous carbon in the emitting dust; the proportion of the former with respect to the latter increases with the dust temperature. The "unidentified" 7.7 and 8.6 μm emission bands are detected at the highest temperatures. A large number of weak SiC features are also found in LRS class 1n; the proportion of C-rich to O-rich giants in the LRS is hence increased to an estimated 60%.

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