NOAO >   Observing Info >   Approved Programs >   2009A-0191

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Proposal Information for 2009A-0191


PI: Roger E. Cohen, University of Florida, cohenr@astro.ufl.edu
Address: Department of Astronomy, Bryant Space Sciences Center, Gainesville, FL 32601, United States

CoI: Ata Sarajedini, University of Florida

Title: Blue Straggler Variability in Galactic Globular Clusters

Abstract: We propose to photometrically monitor the populations of blue straggler stars (BSS) in four Galactic globular clusters to compliment our previous observations of six other clusters. Through the homogeneity of our investigation, we hope to characterize variable BSS, including binaries and SX Phe pulsating variables, in clusters which cover a wide range of physical parameters and which contain significant BSS populations resolvable from the ground. Especially when combined with existing deep HST ACS data for all of our target clusters, these observations promise to provide valuable insight into BSS formation processes and globular cluster dynamics as well as constrain the properties of the host clusters. Through a variability study, we hope to shed light on BSS formation processes as well as the relationship between BSS populations and the physical and dynamical properties of their host clusters, as well as refine existing distance calibrations based on pulsating BSS.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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