Abstract
view Abstract Citations (419) References (75) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Composite Interstellar Grains Mathis, John S. ; Whiffen, G. Abstract The possibility that interstellar grains are composite collections of very small particles, loosely attached to one another, is investigated. The grains are assumed to include a substantial proportion of vacuum along with solid particles. The optical properties of the composite grains are calculated with the approximate 'Bruggeman mixing rule', and the extinction of the grain is calculated wih standard Mie theory. The derived cross sections are close to those of hollow spheres in which the constituents occupy the proper volume fractions, and the derived optical constants of the mixture also obey the Kramers-Kroenig relations. The calculated interstellar extinction law shows reasonable agreement with observations of the diffuse ISM over the 1500-0.12 micron wavelength range. The predicted albedo is 0.5-0.6. It is predicted that the visual extinction per H nucleus should increase slightly with R(V). Publication: The Astrophysical Journal Pub Date: June 1989 DOI: 10.1086/167538 Bibcode: 1989ApJ...341..808M Keywords: Cosmic Dust; Interstellar Extinction; Interstellar Matter; Particle Size Distribution; Amorphous Materials; Graphite; Infrared Spectroscopy; Silicates; Astrophysics; INTERSTELLAR: ABUNDANCES; INTERSTELLAR: GRAINS full text sources ADS |
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