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(C) 中国大陆进口商：中国教育图书进出口有限公司Towards the Identification of the Circumstellar Dust Feature at 13mu
Title:Towards the Identification of the Circumstellar Dust Feature at 13mu
Authors:; ; ; ; ; ;
Publication:Communications of the Konkoly Observatory, No. 100 (Vol. XII, 2), p. 323-326 (1997) ()
Publication Date:01/1997
Origin:KON
Bibliographic Code:
The IRAS LRS data of many O-rich evolved stars show an emission feature
at 13 micron. Al_2O_3 has been proposed in the literature as the carrier
of this band. We compared the average profile from 51 objects with
profiles computed from laboratory data of amorphous and crystalline
Al_2O_3. We found that (1) the 13 micron band could not be fitted by
amorphous Al_2O_3, (2) the 13 micron band could probably be fitted by a
suitable distribution of spherical and ellipsoidal grains of crystalline
alpha-Al_2O_3, and (3) the strength of the 10 micron silicate feature
correlates well with the strength of the 13 micron feature making
silicate a possible carrier of this band.
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