Abstract

HST observations of the eclipsing dwarf nova OY Car after its 1992 April superoutburst are used to isolate ultraviolet spectra (1150–2500 A at 9.2 A FWHM resolution) of the white dwarf, the accretion disk, and the bright spot. The white dwarf spectra have a Stark‐broadened photospheric Lα absorption, but are veiled by a forest of blended Fe II features that we attribute to absorption by intervening disk material. Spectral fits give white dwarf temperatures changing from ∼19500 K just after outburst ∼17400 K around three months after outburst. The temperature of intervening disk material is ∼8600 K–9800 K; the velocity dispersion of the intervening disk material is ∼60–70 km/s. Fitting results also shows that the decay time of white dwarf temperature is ∼27 days, that is much shorter than ∼687 days in dwarf nova WZ Sge.

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