A Search for QSOs Behind Globular Clusters

In order to provide a reference frame against which proper motions of stars in globular clusters might be measured, we have searched for QSOs projected behind (primarily) northern globular clusters. Optical, x-ray, and radio techniques were used to select QSO candidates in these relatively crowded fields. Optical photometry, obtained from both CCD images and UK Schmidt Telescope photographic plates, resulted in most of the QSO identifications. Follow-up spectroscopy on the Multiple Mirror Telescope has confirmed fourteen new QSOs and one H II galaxy in the fields of eight clusters.