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On the Presence of Phyllosilicate Minerals in the Interstellar Grains

Zaikowski, A. and Knacke, R. F. and Porco, C. C. (1976) On the Presence of Phyllosilicate Minerals in the Interstellar Grains. In: Solid State Astrophysics. Astrophysics and Space Science Library. No.55. Springer , Dordrecht, pp. 151-169. ISBN 978-94-010-1886-9.

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The composition of the interstellar silicate dust is investigated. Condensation or alteration of silicate grains at temperatures of a few hundred degrees, in the presence of H_2O, would result in hydrous or phyllosilicates, the silicate type most abundant in the type I carbonaceous chondrites. Infrared spectra of small particles (∼ 0.1 μ) of the high temperature condensates, olivine and pyroxene, at 300 K and 4 K do not give a good match to the interstellar absorption band near 9.8 μ. Laboratory spectra of several phyllosilicates give better agreement as does the spectrum of a carbonaceous chondrite. We propose that the silicates in the interstellar grains are predominantly phyllosilicates and suggest additional spectral tests for this hypothesis.

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Additional Information:© 1976 D. Reidel Publishing Company, Dordrecht, Holland. We gratefully acknowledge the contribution of B. Flaig, H. Rockefeller, and C. S. Springer of the SUSB Chemistry Department in making their infrared spectroscopic equipment available to uso E. Drummond and B. P. Lane of the SUSB Health Science Pathology Department obtained the electron microscope photographs. Meteorite sampies were provided by T. Owen and O. A. Schaeffer. We thank D. H. Lindsleyand J. J. Papike for assistance and valuable comments. A. Z. acknowledges support from AEC grant AT(11-1)3080. C. C. P. acknowledges support from NASA grant NGR 33-015-165.
Funding AgencyGrant Number
NASANGR 33-015-165
Subject Keywords:Interstellar Medium; Layer Silicate; Carbonaceous Chondrite; Hydrous Silicate; Laboratory Spectrum
Series Name:Astrophysics and Space Science Library
Issue or Number:55
Record Number:CaltechAUTHORS:20190610-101222049
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96236
Deposited By: Tony Diaz
Deposited On:10 Jun 2019 17:22
Last Modified:16 Nov 2021 17:19

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