Mid-infrared spectra of WC 9 stars - The composition of circumstellar and interstellar dust

Details Mid-infrared spectra of WC 9 stars - The composition of circumstellar and interstellar dust Mid-infrared spectra of WC 9 stars - The composition of circumstellar and interstellar dust

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344l..13c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. L13-L16.

Astronomy and Astrophysics

Astrophysics

40

Carbon Stars, Infrared Spectra, Interstellar Matter, Stellar Envelopes, Wolf-Rayet Stars, Chemical Composition, Infrared Radiation, Interstellar Extinction

Scientific paper

Broad emission features at about 7.7 microns and absorption features at about 6 and 10 microns observed from the WC 9 stars AFGL 2104 and Ve 2-45 are analyzed. The 7.7-micron feature is shown to resemble the well-known PAH band attributed to CC stretching modes in carbonaceous materials. The results suggest a low H abundance in the outflow of these objects, and that, given a strong UV source, all C-rich dust-enshrouded objects will show (some of) the IR emission bands. It is noted that at least 6 percent of the C and 4 percent of the O are locked up in C=O groups in interstellar silicates.

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