FUSE Observations of the hottest DA white dwarfs
  We report early FUSE observations of the very hot DA white dwarfs PG1342+444 and REJ0558-371. Detection of photospheric absorption lines allows us to estimate the abundances of C, O, Si, P, S and Fe, the first measurements reported for DA stars at such high temperatures. Values of Teff and log g determined for PG1342+444 from the Lyman line series disagree with the results of the standard Balmer line analysis, an issue that requires further investigation. 
M.A. Barstow, M.R. Burleigh, N.P. Bannister, J.B. Holberg and I.   Hubeny