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Present X-ray missions like Chandra and XMM-Newton provide high-resolutionand high-S/N observations of extremely hot white dwarfs, e.g. burst spectra ofnovae. Their analysis requires adequate Non-LTE model atmospheres. TheT\"ubingen Non-LTE Model-Atmosphere Package TMAP can calculate such modelatmospheres and spectral energy distributions at a high level ofsophistication. In the framework of the Virtual Observatory, the GermanAstrophysical Virtual Observatory (GAVO) offers TheoSSA, a Virtual Observatory(VO) service that provides easy access to theoretical SEDs. We present a newgrid of SEDs, that is calculated in the parameter range of novae and supersoftX-ray sources.

Spectral Analyses Of The Hottest White Dwarfs: Grids Of Spectral Energy  Distributions For Extremely Hot, Compact Stars In The Framework Of The  Virtual Observatory