Physics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...443l..85u&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 443, no. 2, p. L85-L88
Physics
26
Annealing, Graphite, Interstellar Matter, Stellar Envelopes, Ultraviolet Absorption, Ultraviolet Spectra, Vapor Deposition, Chemical Composition, Hydrogen, Red Shift
Scientific paper
Since the discovery of the 2175 A absorption bump, this peak has been associated with graphitic particles. Recent development of carbon cluster physics revealed a very robust nanometric carbon structure: onion-like graphitic particle (multishell fullerene). On the basis of laboratory data, we analyze the possible generation of this kind of cluster in interstellar space. In particular, we speculate that tiny nanodiamonds are formed by a chemical vapor disposition (CVD) process in the circumstellar environment and are subsequently thermally annealed to concentrically shelled graphitic particles. These particles have important implications for the UV bump carrier grains, as they would account for observational contraints requiring a narrow shape distribution and also that hydrogen must be involved in the formation mechanism
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