  System parameters of the object LTT560 are determined in order to clarify its
nature and evolutionary status. We apply time-series photometry to reveal
orbital modulations of the light curve, time-series spectroscopy to measure
radial velocities of features from both the primary and the secondary star, and
flux-calibrated spectroscopy to derive temperatures of both components. We find
that LTT560 is composed of a low temperature T~7500K DA white dwarf as the
primary and an M5.5+-1 main-sequence star as the secondary component. The
current orbital period is Porb=3.54(07)h. We derive a mass ratio Msec/Mwd =
0.36(03) and estimate the distance to d=25-40pc. Long-term variation of the
orbital light curve and an additional H-alpha emission component on the white
dwarf indicate activity in the system, probably in the form of flaring and/or
accretion events.
