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Record Details

Record 58 of 8213
The identification of crystalline olivine in cometary silicates
External Online Source: doi:10.1086/167563
Author and Affiliation:
Campins, Humberto(Science Applications International Corp., Tucson, AZ, United States)
Ryan, Eileen V.(Science Applications International Corp., Tucson, AZ, United States)
Abstract: 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.
Publication Date: Jun 15, 1989
Document ID:
19890054928
(Acquired Nov 28, 1995)
Accession Number: 89A42299
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 341; 1059-106
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Science Applications International Corp.; Tucson, AZ, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ASTRONOMICAL SPECTROSCOPY; COSMOCHEMISTRY; HALLEY'S COMET; OLIVINE; SILICATES; COMETARY ATMOSPHERES; CRYSTALLINITY; EMISSION SPECTRA; INFRARED SPECTRA; INTERPLANETARY DUST; SPECTRUM ANALYSIS
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 1059-1066. Research supported by NASA and NSF.
Miscellaneous Notes: Research supported by NASA and NSF
Availability Source: Other Sources
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