Other
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974hrgc.conf..153g&link_type=abstract
H II regions and the galactic centre : proceedings of the Eighth ESLAB Symposium, 4-7 June 1974, Frascati, Italy, p. 153-162 (SE
Other
9
Astronomical Models, Galactic Evolution, Grains, Interstellar Matter, Particle Size Distribution, Far Ultraviolet Radiation, Graphite, Hydrogen Clouds, Regions, Silicates
Scientific paper
A bimodal model of interstellar grains consisting of silicate cores of size approximately 0.06 micron with modified ice mantles of approximately 0.1 micron and very small particles of silicate and/or graphite of size approximately 0.005 micron is followed through various stages of evolution. Starting with a distribution of core-mantle cylinders producing average wavelength dependence of polarization and extinction, changes in physical and optical characteristics of the model are studied going first into regions of dense cloud condensation and coming out at the other end of star formation into young H2 regions. Physical justification is presented to show that not only in dense clouds must the core mantle grains be larger than normal, but also in young H2 regions.
Greenberg Mayo J.
Seung Sebastian H.
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