Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240l..19l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. L19-L22.
Astronomy and Astrophysics
Astrophysics
44
Absorption Spectra, Planetary Nebulae, Protoplanets, Carbon, Emission Spectra, Interstellar Extinction, Silicon Carbides, Stellar Envelopes
Scientific paper
The 3.4-micron absorption band attributed to the C-H stretching vibrational mode in hydrogenated carbon compounds has been discovered in CRL 618. This is the first time that this band is seen in a circumstellar (carbonaceous) envelope, indicating that the corresponding material is formed in such envelopes. The ratio of band depth to extinction is smaller in CRL 618 than in the interstellar medium, perhaps due to a smaller degree of hydrogenation of the material. An absorption band at 12 microns is identified as due to SiC. The SiC/amorphous carbon grain ratio in CRL 618 is similar to that in IRC+10216. The apparent lack of PAH in CRL 618 compared to more evolved objects suggests that PAH are formed from amorphous carbon grains rather than the reverse.
Jourdain de Muizon Marie
Lequeux James
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