Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..750w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 750-756.
Astronomy and Astrophysics
Astrophysics
25
Carbon Stars, Fullerenes, Interstellar Chemistry, Interstellar Extinction, Interstellar Matter, Planetary Nebulae, Chemical Reactions, Hydrocarbons, Molecular Ions
Scientific paper
A case is made for assuming that certain parts of the optical and UV are different facets of one variable component which varies as a whole with position in the interstellar medium. This component is strong in the tenuous gas of the diffuse medium but weak in the dense gas of the clouds. A theory in which the carriers are fullerane molecules and the variability is chemical in origin is described. The color of a fullerane film made in the carbon arc is similar to that of the variable component, and the spectrum of C70 has features which are similar to those of the very broad structure. The fraction of the interstellar carbon abundance needed in the form of the fulleranes is high, but not prohibitively so, and carbon stars and planetary nebulae may be able to provide the molecules. Specific reasons are found for supposing that the fulleranes may be related to the carriers not only of the diffuse interstellar bands but also of the unidentified IR emission features.
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