A 21 micron emission feature in four proto-planetary nebulae

Details A 21 micron emission feature in four proto-planetary nebulae A 21 micron emission feature in four proto-planetary nebulae

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345l..51k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. L51-L54.

Astronomy and Astrophysics

Astronomy

185

Astronomical Spectroscopy, Infrared Sources (Astronomy), Planetary Nebulae, Protoplanets, Stellar Evolution, Asymptotic Giant Branch Stars, Carbon, Cosmic Dust, Infrared Astronomy Satellite, Spectral Energy Distribution, Stellar Envelopes

Scientific paper

The discovery of an unidentified emission feature at 21 microns in the LRS spectra of four IRAS sources is reported. These objects all show large FIR excesses due to a circumstellar dust envelope surrounding a carbon-rich central star and are likely to be in the evolutionary phase between the asymptotic giant branch and planetary nebula stages. The strength of the feature and the carbon richness of the objects suggest that this feature is due to the bending mode of a transient carbon-bearing molecule.

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