SIMBAD references

We have observed the old open clusters M67 and NGC188 with the ROSAT PSPC. In M67 we detect a variety of X-ray sources. The X-ray emission by a cataclysmic variable, a single hot white dwarf, two contact binaries, and some RS CVn systems is as expected. The X-ray emission by two binaries located below the subgiant branch in the Hertzsprung Russell diagram of the cluster, by a circular binary with a cool white dwarf, and by two eccentric binaries with P_b>700d is puzzling. Two members of NGC188 are detected, including the FKCom type star D719. Another possible FKCom type star, probably not a member of NGC188, is also detected.