VOYAGER-2 OBSERVATIONS OF NGC-7023 - DUST SCATTERING SHORTWARD OF 1600-A

We report the first observational determination of the nebular-to-stel lar flux ratio out to wavelengths as short as 1000 angstrom for the re flection nebula NGC 7023, using a combination of spectroscopic data fr om Voyager 2 and from the Hopkins Ultraviolet Telescope (HUT) on the A stro 1 mission. After accounting for contributions by H-2 fluorescence to the nebular flux, the wavelength variation of the ratio of the res idual dust scattered flux to that observable from the embedded star is consistent with a reduction of the dust albedo by 25% over the wavele ngth interval 1300-1000 angstrom. This is most easily interpreted, if the particles responsible for the far-UV rise in the extinction curve are low-albedo, not necessarily zero-albedo, grains. The direct propor tionality between the nebular surface brightness, measured at 22'' off set by HUT, and the nebular flux suggests that the phase function of s cattering does not vary in the 2000-1000 angstrom range.