10694( 1) - 04/05/05 12:42 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10694 Version: 1 Check-in Date: 05-Apr-2005 16:42:30 1.Proposal Title: NGC 6681: The Deepest Ultraviolet Observations of a Globular Cluster ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance AR 14 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. David R. Zurek American Museum of Natural History CoI: Dr. Michael Shara American Museum of Natural History N CoI: Dr. Christian Knigge University of Southampton N CoI: Dr. Andrea Dieball University of Southampton N ------------------------------------------------------------------------------------ 6. Abstract The globular cluster NGC 6681 (M70) has been imaged in the ultraviolet 605 times on 53 occasions resulting in the largest dataset in the far ultraviolet and near ultraviolet that has ever been taken for a globular cluster. The investment in time (about 54 orbits) is not insignificant and has fantastic science possibilities. We propose to retrieve all of these images and discover the various stellar populations, the variables and exotic stars. This study will result in the deepest ever far ultraviolet and near ultraviolet survey of a globular cluster. ------------------------------------------------------------------------------------ 10694( 1) - 04/05/05 12:42 - [ 2] Summary Form for Proposal 10694 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category AR ------------------------------------------------------------------------------------------------------------------------------------