  Following the pulsation spectrum of a white dwarf through the heating and
cooling involved in a dwarf nova outburst cycle provides a unique view of the
changes to convective driving that take place on timescales of months versus
millenia for non-accreting white dwarfs. In 2019 January the dwarf nova V386
Ser (one of a small number containing an accreting, pulsating white dwarf),
underwent a large amplitude outburst. Hubble Space Telescope ultraviolet
spectra were obtained 7 and 13 months after outburst along with optical
ground-based photometry during this interval and high-speed photometry at 5.5
and 17 months after outburst. The resulting spectral and pulsational analysis
shows a cooling of the white dwarf from 21,020 K to 18,750 K (with a gravity
log(g) = 8.1) between the two UV observations, along with the presence of
strong pulsations evident in both UV and optical at a much shorter period after
outburst than at quiescence. The pulsation periods consistently lengthened
during the year following outburst, in agreement with pulsation theory.
However, it remains to be seen if the behavior at longer times past outburst
will mimic the unusual non-monotonic cooling and long periods evident in the
similar system GW Lib.
