10 μm spectral structure in comets.

Details 10 μm spectral structure in comets. 10 μm spectral structure in comets.

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989iaus..135p.417l&link_type=abstract

IAU Symposium No. 135: Interstellar dust: contributed papers, p. 417 - 422

Computer Science

1

Comets: Infrared Spectra, Comets: Olivine, Comets: Dust Grains

Scientific paper

The 10 μm spectra of comets Halley (1982i), Wilson (1986l), Kohoutek (1973f) and Bradfield (1987s) are presented and compared. The silicate emission profiles of Halley and Bradfield are seen to be remarkably similar in that both contain a sharp break in the spectrum at 11.3 μm. The authors interpret the 11.3 μm signature as being due to olivine-type dust grains with at least some degree of crystallinity. Olivine alone is not enough to reproduce the shape of the 10 μm structure. However, in view of a past success in fitting interstellar dust features with the emissivity profile obtained from amorphous grains produced by laser-vaporizing olivine, this is a very appealing identification.

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