Large molecules in the envelope surrounding IRC+10216

Details Large molecules in the envelope surrounding IRC+10216 Large molecules in the envelope surrounding IRC+10216

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.316..195m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 316, Issue 1, pp. 195-203.

Astronomy and Astrophysics

Astronomy

66

Molecular Data, Molecular Processes, Circumstellar Matter, Stars: Individual: Irc+10216, Ism: Molecules

Scientific paper

A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 is developed that includes carbon-containing molecules with up to 23 carbon atoms. The model consists of 3851 reactions involving 407 gas-phase species. Sizeable abundances of a variety of large molecules - including carbon clusters, unsaturated hydrocarbons and cyanopolyynes - have been calculated. Negative molecular ions of chemical formulae C-n and CnH- (7<=n<=23) exist in considerable abundance, with peak concentrations at distances from the central star somewhat greater than their neutral counterparts. The negative ions might be detected in radio emission, or even in the optical absorption of background field stars. The calculated radial distributions of the carbon-chain CnH radicals are looked at carefully and compared with interferometric observations.

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