ORFEUS IIandIUESpectroscopy of EX Hydrae

Using ORFEUS-SPAS II FUV spectra, IUE UV spectra, and archival EUVE deepsurvey photometry, we present a detailed picture of the behavior of themagnetic cataclysmic variable EX Hydrae. Like HUT spectra of this source, theFUV and UV spectra reveal broad emission lines of He II, C II-IV, N III and V,O VI, Si III-IV, and Al III superposed on a continuum which is blue in the UVand nearly flat in the FUV. Like ORFEUS spectra of AM Her, the O VI doublet isresolved into broad and narrow emission components. Consistent with itsbehavior in the optical, the FUV and UV continuum flux densities, the FUV andUV broad emission line fluxes, and the radial velocity of the O VI broademission component all vary on the spin phase of the white dwarf, with themaximum of the FUV and UV continuum and broad emission line flux light curvescoincident with maximum blueshift of the broad O VI emission component. On thebinary phase, the broad dip in the EUV light curve is accompanied by strongeclipses of the UV emission lines and by variations in both the flux and radialvelocity of the O VI narrow emission component. The available data areconsistent with the accretion funnel being the source of the FUV and UVcontinuum and the O VI broad emission component, and the white dwarf being thesource of the O VI narrow emission component.Comment: 21 pages, 10 Postscript figures; LaTeX format, uses aaspp4.sty; table2.tex included separately because it must be printed sideways - see instructions in the file; accepted on 1999 Feb 20 for publication in The Astrophysical Journa