  We demonstrate that plasmon neutrinos are the dominant form of energy loss in
model white dwarf stars down to T_eff ~ 25,000 K, depending on the stellar
mass. The lower end of this range overlaps the observed temperatures for the
V777 Her star (DBV) instability strip. The evolution of white dwarfs at these
temperatures is driven predominantly by cooling, so this directly affects the
stellar evolutionary timescale in proportion to the ratio of the neutrino
energy loss to the photon energy loss. This evolutionary timescale is
observable through the time rate of change of the pulsation periods. Although
the unified electro-weak theory of lepton interactions that is crucial for
understanding neutrino production has been well tested in the high energy
regime, the approach presented here should result in an interesting low-energy
test of the theory. We discuss observational strategies to achieve this goal.
