Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249...99m&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 99-108.
Astronomy and Astrophysics
Astronomy
28
Cosmic Dust, Interstellar Matter, Interstellar Radiation, Orion Nebula, Satellite Observation, Ultraviolet Spectra, Astronomical Models, Iue, Light Scattering, Optical Reflection, Radiative Transfer, Spaceborne Astronomy, Stellar Radiation
Scientific paper
The continuum in the Orion Nebula was observed with the IUE at 16 positions varying from 30 arcsec to 5 arcmin in angular separation from the central star Theta(1) Orionis C. The atomic continuum was estimated from the H-beta brightnesses. The remaining scattered starlight was analyzed by multiple-scattering models in which the main parameters are: (1) the albedo of the dust; (2) the scattering phase function parameter, the averaged cosine of the angle of scattering; and (3) the density of dust grains at small distances from the star. It is found that (a) dust must be depleted near the star; (b) the albedo is fairly well determined and is constant across the 2200 A extinction feature; and (c) grains are quite forward-throwing at 1300 A, as they have been found at 4600 A earlier. The scattering is more isotropic at 2400 A. However, the absolute value of the scattering phase function parameters at all wavelengths is quite uncertain because it depends sensitively upon the density of grains close to the star.
Mathis John S.
Patriarchi Patrizio
Perinotto Mario
Schiffer H. III F.
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