Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..747m&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 747-753. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
52
Circular Polarization, Dielectric Polarization, Graphite, Interstellar Matter, Linear Polarization, Mass Distribution, Particle Size Distribution, Spatial Distribution, Carbon, Interstellar Extinction, Mathematical Models, Oxygen, Particle Density (Concentration), Particle Mass, Silicates, Stellar Mass Ejection
Scientific paper
The linear and circular polarizations of infinite dielectric cylinders of the graphite-silicate mixture with a truncated power-law size distribution proposed by Mathis, Rumpl and Nordsieck (1977) as a model of interstellar particles are calculated. Particles above a specified minimum size are assumed to have perfect Davis-Greenstein alignment, and an index of refraction of 1.6 is used. Results are found to be in good agreement with observations of interstellar extinction between 0.1 and 1 micron, the wavelength dependence of linear and circular polarization, and the albedo and phase function of diffuse galactic light between 0.18 and 0.6 microns, for a maximum particle size of 0.28 micron, a minimum particle size of 0.005 micron and a minimum aligned particle size of 0.08 micron. Observations of mass loss in carbon- and oxygen-rich stars are also noted in support of the proposed graphite-silicate composition of the interstellar grain mixture.
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