  In the course of our search for double degenerate (DD) binaries as potential
progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT
(ESO SN Ia Progenitor surveY - SPY) we discovered HE2209-1444 to be a
double-lined system consisting of two DA white dwarfs. From the analysis of the
radial velocity curve we determined the period of the system to be P = 6h 38m
47s. The semi-amplitudes for both individual components are 109 km/s each. A
model atmosphere analysis enabled us to derive individual temperatures for both
components (8490 K and 7140 K, resp.) and masses of 0.58 Msol for each
component. The total mass of the system is 1.15 +/- 0.07 Msol. The system will
loose angular momentum due to gravitational wave radiation and therefore will
merge within 5 Gyrs -- less than a Hubble time. HE2209-1444 is the second
massive, short period double degenerate detected by SPY. Its total mass is
about 20 % below the Chandrasekhar mass limit and therefore it does not qualify
as a potentional SN Ia progenitor. However, together with our previous
detections it supports the view that Chandrasekhar mass systems do exist.
