Unidentified infrared features in proto-planetary nebulae

Details Unidentified infrared features in proto-planetary nebulae Unidentified infrared features in proto-planetary nebulae

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..363k&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 363-366 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

3

Hydrocarbons, Infrared Spectroscopy, Planetary Nebulae, Protoplanets, Stellar Envelopes, Stellar Evolution, Carbon, Cosmic Dust, Infrared Astronomy Satellite, Molecular Structure, Spectral Resolution, Stellar Spectra

Scientific paper

The discovery of an unidentified emission feature at 21 microns in the spectra of three protoplanetary nebulae is reported. These objects show large far infrared excess due to a circumstellar dust envelope surrounding a carbon rich central star. Optical, infrared and radio observations of three cool Infrared Astronomy Satellite sources suggest that they are carbon rich objects. Their low resolution spectra show a broad unidentified emission feature at 21 microns which could originate from the bending mode of a hydrocarbon molecule. The similarity of all three objects suggests that this feature is unlikely to be the result of instrumental effects.

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