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The identification of crystalline olivine in cometary silicatesAn 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.
Document ID
19890054928
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Campins, Humberto
(Science Applications International Corp. Tucson, AZ, United States)
Ryan, Eileen V.
(Science Applications International Corp. Tucson, AZ, United States)
Date Acquired
August 14, 2013
Publication Date
June 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 341
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A42299
Distribution Limits
Public
Copyright
Other

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