| タイトル | The far-ultraviolet dust albedo in the Upper Scorpius subgroup of the Scorpius OB2 association |
| 著者（英） | Christensen, Susan A.; Witt, Adolf N.; Gordon, Karl D.; Dohne, Brian C.; Carruthers, George R. |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1994-09-10 |
| 言語 | eng |
| 内容記述 | During NRL's Far Ultraviolet Cameras experiemnt 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 lambda(sub eff) = 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. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 95A71218 |
| 権利 | Copyright |
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