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Defining the Binary Star Population in the Young Open Cluster M35 (NGC 2168)

Published online by Cambridge University Press:  01 September 2007

Ella K. Braden ,
Robert D. Mathieu  and
Sören Meibom
Ella K. Braden
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706 email: braden@astro.wisc.edu, mathieu@astro.wisc.edu
Robert D. Mathieu
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706 email: braden@astro.wisc.edu, mathieu@astro.wisc.edu
Sören Meibom
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 email: smeibom@cfa.harvard.edu
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Abstract

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We present current results from the ongoing WIYN Open Cluster Study radial-velocity survey for 1410 stars in the young (150 Myr) open cluster M35 (NGC 2168) and establish a benchmark for initial conditions in young open clusters. We find for periods ≲ 1000 days a minimum binary frequency of 0.36 – 0.51. We also analyze the spatial, period and eccentricity distributions of the binary systems and find that the period and eccentricity distributions are well approximated by scaled field distributions from Duquennoy & Mayor (1991). With our large sample size and long baseline, we have a unique understanding of the binary population in this young cluster, making it ideal for defining initial conditions for dynamical simulations.

Keywords

Stars: binaries: spectroscopicGalaxy: open clusters: individual (M35 (NGC 2168))
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S246: Dynamical Evolution of Dense Stellar Systems , September 2007 , pp. 105 - 106
Copyright
Copyright © International Astronomical Union 2008

References

Duquennoy, A. & Mayor, M. 1991, A & A, 248, 485Google Scholar
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Mathieu, R. D. 1983 PhD thesis, Univ. Calif. BerkeleyGoogle Scholar
Mathieu, R. D. 2000 PASP, 198, 517Google Scholar
Meibom, S. & Mathieu, R. D. 2005 ApJ, 620, 970CrossRefGoogle Scholar