We report the discovery of a new K dwarf rapid rotator with a potentia
l white dwarf companion. The white dwarf accounts for over 90% of the
observed extreme ultraviolet flux detected from this system. Analysis
of ROSAT Wide Field Camera and IUE data both suggest a white dwarf tem
perature of approximately 28,700 K. Optical photometry and the IUE LWP
spectrum (with the white dwarf contribution removed) imply that the l
ate-type star has a spectral type of K1-3 V, and a distance of 55 +/-
5 pc. Using this distance, the observed IUE SWP flux, and the best-fit
temperature results in a white dwarf radius of 0.0088 R.. The estimat
ed white dwarf mass is then approximately 0.91 M.; somewhat over-massi
ve compared to field white dwarfs. Optical photometry of the K star re
veals a ''spot'' modulation period of approximately 10 hr (now observe
d over 3 yr). However, radial velocity observations have revealed no s
ignificant variations. Spectroscopic observations place a low limit on
the lithium abundance, but do show rapid rotation with a upsilon sin
i of 90 +/- 10 km s-1. The K star was detected as a radio source at 3.
6 cm (on two occasions) and 6 cm by the Very Large Array. The most lik
ely evolutionary scenario is that the K star and hot white dwarf form
either a wide binary or common proper motion pair with an age of 0.1-0
.2 Gyr-consistent with the evolutionary timescale of the white dwarf a
nd the rapid rotation of the K star. However, from the proper motion o
f the K star, this system does not seem to be associated with any of t
he known young stellar groups.