Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..909w&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, June 15, 1978, p. 909-916.
Astronomy and Astrophysics
Astronomy
37
Light Scattering, Nebulae, Oao, Ultraviolet Photometry, Early Stars, Forward Scattering, Interstellar Matter, Spaceborne Astronomy, Spatial Distribution
Scientific paper
Surface-brightness measurements are presented that cover the region of Orion in nine intermediate-width bandpasses ranging from 4250 to 1550 A. The existence of an extended ultraviolet reflection nebulosity in this area is confirmed, and the characteristics of its spectrum and spatial distribution are derived. The observations are consistent with a model in which the dense molecular cloud complex in Orion is illuminated by the foreground Orion aggregate of early-type stars. The interpretation is complicated by the fact that foreground dust may contribute to the observed scattered light. The scattering particles in the cloud appear to exhibit a wavelength-dependent albedo similar to that found for interstellar grains in general, with a strong indication that the phase function changes to a less forward-scattering form in the ultraviolet.
Lillie Chuck F.
Witt Adolf N.
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