Solid hydrogen coated graphite particles in the interstellar medium-I

Wickramasinghe, N. C. ; Krishna Swamy, K. S. (1969) Solid hydrogen coated graphite particles in the interstellar medium-I Monthly Notices of the Royal Astronomical Society, 144 . pp. 41-54. ISSN 0035-8711

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Solid hydrogen coated graphite particles may be expelled from regions of star-formation into the general interstellar medium. The solid para-hydrogen mantles, which contain a small proportion of ortho-H2 could be stable against evaporation in the general interstellar radiation field. They are also stable against physical and chemical sputtering in H 1 regions. Extinction efficiencies are calculated for solid hydrogen particles and for graphite particles with solid hydrogen mantles. Graphite core-solid hydrogen grains are capable of producing excellent agreement with the interstellar extinction observations from 20 000-1100 Å. The graphite core radius may be in the range γ0 = 0.04-0.06 µ and the solid hydrogen mantle radius in the range γ = 0.15-0.25µ. The albedo and phase function of these particles are consistent with the requirements imposed by[the diffuse galactic light.

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Deposited On:20 Mar 2012 14:31
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