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Astron. Astrophys. 359, 799-810 (2000)

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Condensation and growth of hydrogenated carbon clusters in carbon-rich stars

G. Pascoli and A. Polleux

Faculté des Sciences, Département de Physique, 33 rue Saint Leu, 80039 Amiens Cedex, France

Received 22 September 1999 / Accepted 28 February 2000


Hydrogenated carbon cluster growth in carbon-rich stellar atmospheres is simulated by a model which takes into account the simultaneous formation of carbon compounds with carbon atoms under various states of hybridization. A grid of computations shows that a mixture of different species can appear (small hydrogenated carbon clusters, carbon chains or ring-shaped structures, aromatic-like entities, etc.) depending on both carbon to hydrogen relative abundance and temperature of the star. Dehydrogenation rate and sp2/sp and sp3/sp ratios are estimated.

Key words: molecular processes – stars: circumstellar matter – ISM: general – ISM: molecules

© European Southern Observatory (ESO) 2000

Online publication: July 7, 2000