Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..561m&link_type=abstract
Astronomy and Astrophysics 288, 561-571 (1994)
Astronomy and Astrophysics
Astrophysics
78
Stars: Carbon, Circumstellar Matter, Stars: Irc+10216, Molecular Processes
Scientific paper
A new chemical model of the circumstellar envelope surrounding the carbon-rich star IRC+10216 has been developed. This model incorporates a variety of newly measured rapid neutral-neutral reactions between carbon atoms and hydrocarbons and between the radical CN and a variety of stable neutral molecules. In addition, other neutral-neutral reactions in the above two classes or involving atoms such as N or radicals such as C_2n_H have been included with large rate coefficients although they have not yet been studied in the laboratory. Unlike the interstellar case, where the inclusion of these neutral-neutral reactions destroys molecular complexity, our model results for IRC+10216 show that sufficient abundances of large hydrocarbon radicals and cyanpolyynes can be produced to explain observations. We also discuss the formation of H_2_CN and NH_2_CN, two potentially observable molecules in IRC+10216.
Herbst Eric
Millar Thomas J.
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