NOAO >   Observing Info >   Approved Programs >   2011A-0260

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Proposal Information for 2011A-0260


PI: Mel Blake, University of North Alabama, rmblake@una.edu
Address: Physics Department, University of North Alabama, Florence, Alabama 35630, USA

CoI: Daniel Johnson, University of North Alabama

Title: A Search for Variable Stars in Two Old Open Clusters

Abstract: Variable stars in old open star clusters offer the opportunity to understand both classes of objects in ways not possible in studying them separately. Knowing the age and composition of a star cluster tells us about the evolutionary state of variable stars it might contain. On the other hand, the presence of variable stars such as eclipsing binaries can provide information on the distance and masses of stars in the cluster. The position of the variables on the color-magnitude diagram can tell us about its evolutionary history. Here we propose to conduct a search for contact variable stars in two old open clusters, NGC6005 and Ruprecht 134 using the 1.0m telescope at CTIO. These clusters are each about 1Gyr old, but NGC6005 has 16 blue straggler stars while Ruprecht 134 has none. This will allow further understanding of the relationship between blue straggler populations and formation of contact binaries.


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NOAO >   Observing Info >   Approved Programs >   2011A-0260

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