On the abundance of silicon carbide dust in the interstellar medium

Details On the abundance of silicon carbide dust in the interstellar medium On the abundance of silicon carbide dust in the interstellar medium

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..427w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 1, 1990, p. 427-431. Research supported by SE

Astronomy and Astrophysics

Astronomy

47

Abundance, Cosmic Dust, Galactic Nuclei, Interstellar Matter, Silicon Carbides, Interstellar Extinction, Line Of Sight, Optical Thickness, Ultraviolet Spectra, Visible Spectrum

Scientific paper

Spectral evidence relevant to the possible existence of SiC in the diffuse interstellar medium is examined, using the line-of-sight to the Galactic Center as a basis for discussion. It is found that the abundance of Si in SiC dust is no more than about 5 percent of that in silicates. Consequently, SiC particles probably contribute at most a few percent of the total extinction at visible and UV wavelengths. If SiC is a significant fraction of the total mass of stardust ejected into the interstellar medium, it is most probably destroyed by oxidation on a time-scale of about 50 million yr in diffuse clouds.

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