On the 21-MICRON Feature of Pre-Planetary Nebulae

Details On the 21-MICRON Feature of Pre-Planetary Nebulae On the 21-MICRON Feature of Pre-Planetary Nebulae

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254l...1s&link_type=abstract

Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. L1, 1992

Astronomy and Astrophysics

Astrophysics

25

Interstellar Medium: Dust. Infrared Radiation

Scientific paper

Possible carriers of the 21-μm feature are discussed.After considering organic coals and ferrocenes, we present the case for the N-C-N and O-C-N deformation vibrations of simple amides.It is shown that carbamide, CO (NH2)2, mixed with organic coal (to provide the continuum) and SiC (to provide the 1l.3-μm band), in a cool extended, circumstellar envelope, can reasonably reproduce the mid- and far-ir spectra of the two best documented pre-planetary nebulae which emit the 21-μm feature. We also hint at the relation to the LRS spectra of many stars which exhibit broad 11.5- and 20-μm features.

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