Dust grains in reflection nebulae: spherical core--mantle grains

Journal Article · Fri Sep 01 04:00:00 EDT 1978 · Sov. Astron. AJ (Engl. Transl.); (United States)

OSTI ID:6464060

Voshchinnikov, N V

The U-B, B-V, V-R color indices and the U, B, V, R percentage polarization are calculated for a homogeneous spherical nebula in the single-scattering approximation. Guettler's theory is applied to determine scattering functions for ensembles of model silicate grains with ice mantles; in each case the grain cores have a given radius, while the mantles have an exponential size distribution. These two-layer grains have materially different optical properties from homogeneous particles composed of the core or mantle substance. The calculations show that the colors and polarization of nebulae consisting of two-layer grains will depend most on the grain size and on the relative core and mantle size; small changes in the imaginary part of the refractive indices of the core and mantle have little effect on the final result. The polarization of such nebulae will be quite strong and nearly always positive.

• Research Organization: Leningrad University
• OSTI ID: 6464060
• Journal Information: Sov. Astron. AJ (Engl. Transl.); (United States), Journal Name: Sov. Astron. AJ (Engl. Transl.); (United States) Vol. 22:5; ISSN SAAJA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COLOR
CONDENSATION NUCLEI
COSMIC DUST
CRYSTAL STRUCTURE
DATA
DATA FORMS
DISTURBANCES
DUSTS
GALAXIES
GRAIN SIZE
ICE
INFORMATION
INTERSTELLAR GRAINS
ISOLATED VALUES
MATHEMATICAL MODELS
MICROSTRUCTURE
NEBULAE
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
OXYGEN COMPOUNDS
PARTICLE SIZE
PARTICLES
PHOTOMETRY
PHYSICAL PROPERTIES
POLARIZATION
REFRACTION
SILICATES
SILICON COMPOUNDS
SIZE
STAR MODELS
THEORETICAL DATA