Shock wave emission at Miller's position 1 in the Cygnus Loop

We present the far-UV spectrum (900-1800 Angstrom) of the bright filament k nown as Miller's (1974) position 1 in the Cygnus Loop obtained with the Hop kins Ultraviolet Telescope during the Astro-2 space shuttle mission. Longer wavelength IUE and ground-based spectra of adjoining regions were scaled t o produce a combined spectrum ranging from 900 to 7500 Angstrom. We compare this spectrum with models of radiative shock waves to infer shock velociti es and elemental abundances. A power-law distribution of shock velocities w ithin the spectrograph apertures can reproduce the observed spectrum. We co nsider the question of whether a simpler shock structure, thermally unstabl e cooling, or a mixing layer could produce a similar spectrum. We also disc uss the elemental abundances with particular attention to C and Si, whose l ines are only available in the UV.