Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977azh....54.1221v&link_type=abstract
Astronomicheskii Zhurnal, vol. 54, Nov.-Dec. 1977, p. 1221-1231. In Russian.
Astronomy and Astrophysics
Astronomy
1
Astronomical Models, Astronomical Photometry, Cosmic Dust, Interstellar Matter, Nebulae, Ubv Spectra, Interstellar Radiation, Optical Reflection
Scientific paper
(U-B), (B-V), and (V-R) color indexes and the degree of polarization in the U, B, V, and R bands are calculated for models of a reflection nebula whose illuminating star is associated with an extended dust cloud. The nebula is assumed to be spherical in the case where the illuminating star is far from the cloud edge, but part of the nebula boundary is considered to be flat in the case where the star is close to the cloud edge. Single scattering in a homogeneous nebula is examined, and light scattering by spherical dust grains is analyzed using Mie theory. Effects of variations in grain chemical composition, the grain-size distribution function, and the position of the illuminating star are investigated. The theoretical results are compared with observations of the nebula around Merope (IC 349), and good agreement is obtained for an ice-particle model of the nebula with the star embedded in the nebula at a distance of 0.7 pc from its leading edge.
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