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The WIYN Open Cluster Study Photometric Binary Survey: Initial Findings for NGC 188

Published online by Cambridge University Press:  01 September 2007

P. M. Frinchaboy  and
D. Nielsen
P. M. Frinchaboy
Affiliation:
National Science Foundation Astronomy & Astrophysics Postdoctoral Fellow, University of Wisconsin–Madison, Department of Astronomy, 4506 Sterling Hall, 475 N. Charter Street, Madison, WI 53706, USA email: frinchaboy@wisc.edu
D. Nielsen
Affiliation:
Department of Physics & Astronomy, Colby College, 860 Mayflower Hill Drive, Waterville, ME 04901
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Abstract

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The WIYN open cluster study (WOCS) has been working to yield precise optical (UBRVI) photometry for all stars in the field of a selection of “prototypical” open clusters. Additionally, WOCS has been using radial velocities to obtain orbit solutions for cluster member hard-binary stars (with period less than 1000 days). Recently, WOCS has been expanded to include the near-infrared (JHKs; 2MASS plus new deep ground-based) and mid-infrared ([3.6], [4.5], [5.8], [8.0] micron) photometry from Spitzer/IRAC observations. This multi-wavelength data (0.3–8.0 microns) allows us to identify binaries photometrically, with mass ratios from 1.0–0.3, across a wide range of primary masses. The spectral energy distribution (SED) fitter by Robitaille et al. (2007) is used to fit the fluxes of 10–12 bands to Kurucz stellar models. This technique allows us to explore the soft binary population for the first time. Using this photometric technique, we find that NGC 188 has a binary fraction of 36-49% and provide a star-by-star comparison to the WOCS radial velocity-based hard binary study.

Keywords

open clusters and associations: individual (NGC 188)binaries: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 109 - 110
Copyright
Copyright © International Astronomical Union 2008

References

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