Long carbon chains and small hydrocarbons in CRL 618

Details Long carbon chains and small hydrocarbons in CRL 618 Long carbon chains and small hydrocarbons in CRL 618

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..285c&link_type=abstract

The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 285

Physics

Evolved Stars, Crl618, Long Carbon Chains, Pahs

Scientific paper

We present ISO results concerning the infrared emission of AGB and post-AGB C-rich stars. In AGB stars like IRC+10216, the spectrum is dominated by the absorption bands of C2H2 and HCN, although some HCN bands appear in emission. In proto-planetary nebula like CRL618 the infrared spectrum observed by ISO shows an incredible abundance of carbon chains and small hydrocarbons. Taking into account the richness of the infrared spectrum of this source an important help from laboratory data is needed. Millimeter wave observations of the same object indicate that the emission arises from the innermost shocked region, i.e., from the interaction of the extremely fast wind from the central star and the remnant envelope of the AGB phase. Among the new molecular species detected for the first time in the CRL618, and also in the interstellar space, are C4H2 and C6H2, and perhaps some small hydrocarbons

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