Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..50...43c&link_type=abstract
Astrophysics and Space Science, vol. 50, no. 1, Aug. 1977, p. 43-53. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
4
Copolymers, Granular Materials, Interstellar Chemistry, Interstellar Extinction, Methylene, Polymerization, Astronomical Models, Formaldehyde, Graphite, Interstellar Matter, Iron
Scientific paper
It is shown that conditions in dense molecular clouds favor the polymerization of H2CO molecules and the deposition of formaldehyde copolymer mantles, with typical radii of about 10 to the minus fifth cm, on smaller refractory grains. These moderately refractory grains may be responsible for the bulk of interstellar extinction and polarization at optical wavelengths if a significant fraction of such copolymer coated grains are expelled with systematic gas flows into the general interstellar medium. Mie calculations for a mixture consisting of iron, graphite, and polyoxymethylene (POM) particles are presented as an example where POM grains of radii 0.15 microns dominate the extinction at optical wavelengths, providing a satisfactory overall fit to a range of extinction data. A size distribution of POM needles with a 'mean' radius 0.15 microns also provides good agreement with data on interstellar linear as well as circular polarization.
Cooke Andrew
Wickramasinghe Chandra N.
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