The Effect of a Superoutburst on the White Dwarf and Disk of VW Hydri as observed with FUSE
Knox S. Long, Boris T. Gaensicke, Christian Knigge, Cynthia S. Froning, and Berto Monard

TL;DR
This study uses FUSE observations to analyze the cooling and spectral components of the white dwarf in VW Hydri after a superoutburst, revealing details about its temperature, composition, and accretion disk behavior.
Contribution
It provides new insights into the spectral components of VW Hydri's white dwarf and accretion disk during quiescence following a superoutburst, including temperature evolution and spectral features.
Findings
White dwarf temperature drops from 24,000K to 20,000K post-superoutburst
Detected spectral evidence of CNO processed material on the WD surface
Identified a featureless component likely from the hot spot, fading after 10 days
Abstract
We have used FUSE to obtain thirteen observations of the dwarf nova VW Hyi covering the period from the end of a superoutburst through the following normal outburst of the system. Here, we present the quiescent spectra. They contain at least three components. The dominant component is the white dwarf (WD), which cools following the superoutburst. The amount of cooling depends somewhat on the WD models used. For log g of 8.0, the temperature drops from 24,000K just after the outburst to 20,000 K just before the normal outburst. For this model, and a distance of 65 pc, the WD radius is ~8 x 10**8 cm and v sin(i) is ~420 km/s. The fact that the derived radius is smaller than expected for a WD with log g=8 suggests a higher gravity WD or that VW Hyi is somewhat further than 65 pc. Either is possible given the current distance uncertainty of +-20 pc. Earlier suggestions that the WD…
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