Back to Volume
Paper: Magnetic CVs in Globular Clusters
Volume: 157, Annapolis Workshop on Magnetic Cataclysmic Variables
Page: 377
Authors: Grindlay, Jonathan E.
Abstract: Cataclysmic variables (CVs) are tracers of dynamical evolution in globular clusters. A significant sample has been found by the relatively shallow Hα surveys conducted with HST thus far in just three globulars: NGC 6397 (3 objects), NGC 6752 (2), and omega Cen (2). These are identified with the low-luminosity X-ray sources discovered in these globulars with similarly moderate-depth ROSAT surveys. Follow-up spectroscopy of the initial 3 CV candidates in NGC 6397 with the FOS on HST suggests they may be magnetic CVs of the intermediate polar (IP) type, and follow-up deep imaging with both HST and ROSAT yield a 4th confirmed and 5th strong candidate CV near the center of this collapsed-core cluster. The optical versus X-ray properties of the 4 confirmed IP candidates in NGC 6397 are compared with disk IPs, and arguments for and against this interpretation are presented. The possible strong excess of magnetic CVs in globulars will be tested with much deeper HST/AXAF surveys.
Back to Volume