Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0810g&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #08.10; Bulletin of the American Astronomical Society, Vol. 25, p.805
Astronomy and Astrophysics
Astronomy
Scientific paper
The far-UV scattering properties, the albedo and scattering phase function asymmetry, of dust in the region within 10deg of rho Oph were investigated. Ultraviolet images of this region were obtained during the Far UV Cameras' experiment (NRL-803), part of the Air Force Space Test Program's AFP-675 payload, which flew aboard the Space Shuttle in May 1991 (STS-39). Camera #1 observed in the wavelength region 1230-1600 Angstroms (lambda_ {eff} = 1415 Angstroms) and Camera #2 observed in the wavelength region 1650-2000 Angstroms (lambda_ {eff} = 1825 Angstroms). Each camera possessed a 20deg field of view with an angular resolution of approximately 3'. In both bandpasses, the rho Oph region appears as an extended reflection nebula filling a substantial fraction of the field of view, with some foreground dark nebulae silhouetted against the scattered light background. Typical intensities for the rho Oph nebula at 1415 Angstroms range from 2*E(4) to 1*E(5) photons/(cm(2) s sr Angstroms). Using four UV images of the rho Oph region (two from each camera) and the fluxes of the region's 31 brightest B-type stars, the nebular to stellar flux ratio was calculated. After subtracting an appropriate amount of sky background, the ratios were 1.10 +/- 0.12 (@1415 Angstroms) and 0.96 +/- 0.16 (@1825 Angstroms). Using a Monte Carlo model which assumes a spherically symmetric distribution of dust and an extended stellar emission region, the dust scattering properties matching the observed nebular to stellar flux ratio were determined. These results, specifically the albedo (a) and the scattering phase function asymmetry (g), will be presented. Program support was made available by the Office of Naval Research, the flight opportunity was provided by the DoD Space Test Program, and additional support was derived from NASA LTSA Grant NAGW-3168.
Carruthers George R.
Christensen Susan A.
Dohne Brian C.
Gordon Karl Douglas
Witt Adolf N.
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