A Lifetime of Influence: Abstracts, Talks, and Posters
 

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van den Heuvel

  

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An Updated Catalog of Massive Binaries in Cygnus OB2

Chip Kobulnicky
University of Wyoming

Dan Kiminki
University of Wyoming

As part of an ongoing study to determine the distribution of orbital parameters for massive binaries, we present the orbital solutions for several new double- and single-lined spectroscopic binaries in Cygnus OB2. We also present the first spectroscopic data confirming the double-lined nature of Schulte~73. Spectroscopic survey data from 1999 through 2008 have yielded ~10 new OB binaries with orbital solutions, bringing the present number of confirmed binaries in CygOB2 to 16. The continuing survey, using primarily data from the Wyoming Infrared Observatory 2.3 m telescope, is in the process of determining orbital parameters for many more systems that show radial velocity variability on timescales of months to years. Our eventual goal is to characterize the binary frequency and distribution of masses and periods for massive binaries using an unbiased sample from a young and populous OB association. Knowledge of these fundamental binary parameters will inform theories of massive star formation and the genesis of supernovae and gamma ray bursts through binary channels.