  We present the discovery of an unusual, tidally-distorted extremely low mass
white dwarf (WD) with nearly solar metallicity. Radial velocity measurements
confirm that this is a compact binary with an orbital period of 2.6975 hrs and
a velocity semi-amplitude of K = 108.7 km/s. Analysis of the hydrogen Balmer
lines yields an effective temperature of Teff = 8380 K and a surface gravity of
log g = 6.21 that in turn indicate a mass of M = 0.16 Msol and a cooling age of
4.2 Gyr. In addition, a detailed analysis of the observed metal lines yields
abundances of log Mg/H = -3.90, log Ca/H = -5.80, log Ti/H = -6.10, log Cr/H =
-5.60, and log Fe/H = -4.50, similar to the sun. We see no evidence of a debris
disk from which these metals would be accreted though the possibility cannot
entirely be ruled out. Other potential mechanisms to explain the presence of
heavy elements are discussed. Finally, we expect this system to ultimately
undergo unstable mass transfer and merge to form a ~0.3-0.6 Msol WD in a few
Gyr.

Solar and Stellar Astrophysics