Other
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341.1059c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 1059-1066. Research supported by NASA and NSF.
Other
138
Astronomical Spectroscopy, Cosmochemistry, Halley'S Comet, Olivine, Silicates, Cometary Atmospheres, Crystallinity, Emission Spectra, Infrared Spectra, Interplanetary Dust, Spectrum Analysis, Comets, Silicates, Crystaline, Olivine, Halley, Spectra, Wavelengths, Abundance, Infrared, Comparisons, Interplanetary Dust, Meteorites, Idps, Earth-Based Observations, Carbonaceous Chondrites, Laboratory Studies, Composition, Origin, Spectrophotometry
Scientific paper
An intermediate-resolution spectrum of the 8-13 micron region in comet Halley is obtained which shows a prominent silicate emission feature with structure not observed before in other comets or in interstellar silicates. The presence of a strong 11.3 micron peak reported by Bregman and coworkers is confirmed, and evidence is found for additional structure in the band. By comparison with spectra of interplanetary dust particles and laboratory silicates, it is concluded that small crystalline olivine particles are a major component of the silicates in this comet; other silicates (e.g., amorphous or hydrated) must also be present. The identification of crystalline olivine in this part of the spectrum is supported by the observation of four peaks in 20-50 micron airborne spectra of this comet which have also been attributed to olivine.
Campins Humberto
Ryan Eileen V.
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