Large molecules in the envelope surrounding IRC+10216

TJ Millar, E. Herbst, R.P.A. Bettens

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118 Citations (Scopus)


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 less than or equal to n less than or equal to 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.
Original languageEnglish
Pages (from-to)195-203
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 21 Jul 2000

ASJC Scopus subject areas

  • Space and Planetary Science


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