Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..121p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 1/JUL1, P. 121, 1994
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The equilibrium temperature of composite carbon grains is shown to be a sensitive function of the ratio of aromatic (sp2) to diamond (sp3) bonded carbon in the grain. Calculations have been carried out for grains with radii 0.001 < a < 0.1 iim and compositions that consist of niixtures of aromatic carbon, diamond-like carbon, polymeric carbon and voids. An effective medium approximation has been used to estimate dielectric constants for such materials. Our results indicate that the addition of a small amount of aromatic carbon results in a dramatic reduction in grain temperature. Grain temperatures as low as 11 K are found under certain conditions when Av= 0. The relevance of this to the condensation of solid CO on dust grains in clouds is briefly discussed. Key words: atomic processes - ISM: abundances - ISM: atoms - dust, extinction - ISM: molecules.
Duley Walter W.
Pinho G. P.
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