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The far-ultraviolet dust albedo in the Upper Scorpius subgroup of the Scorpius OB2 association

1994; IOP Publishing; Volume: 432; Linguagem: Inglês

10.1086/174602

1538-4357

Karl D. Gordon, Adolf N. Witt, G. R. Carruthers, Susan A. Christensen, Brian C. Dohne,

Solar and Space Plasma Dynamics

view Abstract Citations (50) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Far-Ultraviolet Dust Albedo in the Upper Scorpius Subgroup of the Scorpius OB2 Association Gordon, Karl D. ; Witt, Adolf N. ; Carruthers, George R. ; Christensen, Susan A. ; Dohne, Brian C. 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. Publication: The Astrophysical Journal Pub Date: September 1994 DOI: 10.1086/174602 Bibcode: 1994ApJ...432..641G Keywords: Albedo; Cosmic Dust; Monte Carlo Method; Reflection Nebulae; Scorpius Constellation; Stellar Spectra; Ultraviolet Radiation; Astronomical Models; Radiative Heat Transfer; Ultraviolet Astronomy; Astrophysics full text sources ADS | data products SIMBAD (38) MAST (1)