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Title:
The far-ultraviolet dust albedo in the Upper Scorpius subgroup of the Scorpius OB2 association
Authors:
Gordon, Karl D.; Witt, Adolf N.; Carruthers, George R.; Christensen, Susan A.; Dohne, Brian C.
Affiliation:
AA(The University of Toledo, Toledo, OH, US), AB(The University of Toledo, Toledo, OH, US), AC(Naval Research Laboratory, Washington, DC, US), AD(Naval Research Laboratory, Washington, DC, US), AE(Naval Research Laboratory, Washington, DC, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 2, p. 641-647 (ApJ Homepage)
Publication Date:
09/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Albedo, Cosmic Dust, Monte Carlo Method, Reflection Nebulae, Scorpius Constellation, Stellar Spectra, Ultraviolet Radiation, Astronomical Models, Radiative Heat Transfer, Ultraviolet Astronomy
DOI:
10.1086/174602
Bibliographic Code:
1994ApJ...432..641G

Abstract

During NRL's Far Ultraviolet Cameras experiment on STS-39, four images of the giant reflection nebula encompassing the Upper Scorpius subgroup of the Sco OB2 association were obtained in two ultraviolet bandpasses with lambdaeff = 1362 A and 1769 A. From these images and IUE and TD-1 stellar spectra, the ratio of nebular to stellar flux was calculated. The ratio ranged from 0.577 to 0.921 at 1362 A and 0.681 to 0.916 at 1769 A with the spread in the ratio arising mainly from uncertainties in the sky background. In order to analyze these images, a model utilizing Monte Carlo techniques to describe radiative transfer in a spherical nebula with asymmetrically distributed stars was developed by elaborating on previous work by Witt. This model was used to determine the range of albedos reproducing the observed nebular-to-stellar flux ratios while allowing the scattering phase function asymmetry to vary between 0.0 and 0.8. The resulting albedos were 0.47-0.70 at 1362 A and 0.55-0.72 at 1769 A.

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