NOAO >   Observing Info >   Approved Programs >   2013B-0159

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Proposal Information for 2013B-0159


PI: Elliott Horch, Southern Connecticut State University, horche2@southernct.edu
Address: Department of Physics, 501 Crescent Street, New Haven, CT 06515, USA

CoI: Robert Mathieu, University of Wisconsin-Madison
CoI: Aaron Geller, Northwestern University

Title: Completing the Multiplicity Survey of M35 and M67 with the Differential Speckle Survey Instrument

Abstract: The open clusters M35 and M67 are very different in age, but both are at a similar distance from the solar system (~850 pc). We propose to complete our diffraction-limited imaging survey of all cluster members of M35 and M67 to 14th magnitude and known spectroscopic binaries to 15th magnitude in order to detect companions with projected physical separations as small as ~30 AU. This will be complementary to previous spectroscopic work on these clusters at WIYN and will increase our knowledge of the binary and multiple star populations across ~8 decades in period, including both the dynamically hard and soft systems. The comparison between the two clusters will give a clear indication of whether triples form primordially and with what frequency, as well as the evolution of wide binary and triple populations with dynamical age. Images will be obtained with the Differential Speckle Survey Instrument (DSSI), which is currently at WIYN. DSSI is a two-channel speckle imaging system that provides high-quality diffraction-limited images and color information with a limiting magnitude of ~15. Three more nights of data are needed to complete the project.


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