X-RAYS FROM OLD OPEN CLUSTERS - M-67 AND NGC-188

We have observed the old open clusters M 67 and NGC 188 with the ROSAT PSPC. In M 67 we detect a variety of X-ray sources. The X-ray emissio n by a cataclysmic variable, a single hot white dwarf, two contact bin aries, and some RS CVn systems is as expected. The X-ray emission by t wo binaries located below the subgiant branch in the Hertzsprung Russe ll diagram of the cluster, by a circular binary with a cool white dwar f, and by two eccentric binaries with P-b greater than or similar to 7 00d is puzzling. Two members of NGC 188 are detected, including the FK Com type star D719. Another possible FK Com type star, probably not a member of NGC 188, is also detected.