AAS 207th Meeting, 8-12 January 2006
Session 114 Massive Binaries
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[114.01] Candidate Massive Binaries in Cygnus OB2

S. Irwin (Univbersity of Texas), D. Kiminki, K. Kinemuchi, H.A. Kobulnicky, M. Pierce, A. Monson (University of Wyoming)

Long term radial velocity monitoring of >100 massive stars in the Cygnus OB2 Association has identified ~20 stars with probable radial velocity variations over the period 1999-2005. We present a preliminary analysis of new R=4000 spectroscopic data from the Wyoming Infrared Observatory 2.3m telescope. A subset of ten stars with the most pronounced changes were observed with the fiber spectrograph, WIROSpec, over the wavelength range 4100-4900 Å. Stellar winds or pulsations may account for the apparent velocity variability for some of the objects. However, several objects are candidates for new massive binaries in CygnusOB2. These candidates can be used to infer the binary frequency and the distribution of mass ratios and orbital separations among early type binary systems.

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