Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..195f&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 195-200.
Astronomy and Astrophysics
Astronomy
91
Carbon Stars, Emission Spectra, Far Infrared Radiation, Infrared Astronomy, Planetary Nebulae, Stellar Spectra, Grains, Microwave Spectra, Stellar Envelopes, Stellar Temperature
Scientific paper
The 16-30 micron spectra of several carbon stars and the planetary nebulae IC 418 and NGC 6572 have been obtained using the NASA C-141 Kuiper Airborne Observatory. A newly observed emission feature appears in the spectrum of IRC +10216 and several other carbon stars at wavelengths greater than 24 microns. The feature is interpreted as resulting from a solid-state resonance in the dust grains which have condensed around these stars. A similar feature appears in the spectra of IC 418 and NGC 6572, implying that the same type of dust is present. Since the dust probably condensed from a carbon-rich gas, this indicates an evolutionary link between carbon stars and these planetary nebulae. No identification for the grain material has been found, but some clues are apparent which could aid in the identification.
Forrest William John
Houck James R.
McCarthy Joseph F.
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