New Massive Binaries in the Cygnus OB2 Association

Details New Massive Binaries in the Cygnus OB2 Association New Massive Binaries in the Cygnus OB2 Association

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915333s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.33

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Scientific paper

We present results from a continuing radial velocity survey of the massive stars in the Cygnus OB2 Association using spectroscopic data from 2010 June through 2011 November obtained with the 2.3 m Wyoming Infrared Observatory telescope. We find that the early-type star MT267 is a single-lined spectroscopic binary with primary spectral class O8I. The orbital period is 15.03±0.08 days and its eccentricity is near zero. We also present preliminary results for several other candidate binary systems in the Association. This work brings the total number of known massive binaries in Cyg OB2 to at least 21, most of which have nearly complete orbital solutions. Statistics of massive binaries from this program can be used to constrain models of massive star formation and to estimate the rates of energetic phenomena such as supernovae and gamma-ray bursts that form through binary channels.

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