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The three micron 'ice' band in grain mantlesAttention is given to the influence of different mantle constituents on extinction and polarization due to H2O absorption in grain mantles, particularly the 3250/cm band. With respect to BN, the simultaneous reproduction of the extinction and polarization band shapes occurs by normal size particles containing mixtures of H2O with other molecules. As regards the 3-micron absorption in OH 231.8 plus 4.2, the data can be best fitted with pure amorphous H2O grains which have been heated to (or created at) about 80 K. The variation in grain mantle composition between young stellar objects and late-type stars loosing mass is attributed to a fundamental difference in grain formation and evolution.
Document ID
19830040001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hagen, W.
(Leiden Univ. Netherlands)
Greenberg, J. M.
(Leiden Rijksuniversiteit, Leiden, Netherlands)
Tielens, A. G. G. M.
(NASA Ames Research Center Moffett Field, CA; Leiden, Rijksuniversiteit, Leiden, Netherlands)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Astronomy and Astrophysics
Volume: 117
Issue: 1, Ja
Subject Category
Astrophysics
Accession Number
83A21219
Distribution Limits
Public
Copyright
Other

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