Unidentified infrared features in proto-planetary nebulaeThe 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.
Document ID
19900009814
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kwok, S. (Calgary Univ. (Alberta). IN., United States)
Hrivnak, B. J. (Valparaiso Univ.)
Date Acquired
September 6, 2013
Publication Date
September 1, 1989
Publication Information
Publication: ESA, Infrared Spectroscopy in Astronomy