  We present preliminary results of a study aimed at detecting double white
dwarf systems using a method based on a comparison of optical and UV spectra
for 141 DA stars drawn from the IUE archives. In particular, we are looking for
dicrepancies between optical and UV temperatures. Even though known unresolved
degenerate binaries stand out in this comparison, most temperature differences
can probably be attributed to the presence of reddening, or the presence of
heavy elements. We are in the process of securing additional optical
spectroscopic observations to increase the number of stars in our analysis.
