An Update on the Radial Velocity Survey in Cygnus OB2

Details An Update on the Radial Velocity Survey in Cygnus OB2 An Update on the Radial Velocity Survey in Cygnus OB2

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916213k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #162.13; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We conducted a radial velocity survey of the Cygnus OB2 Association over a 7-year (1999 2006) time interval to search for massive close binaries. During this time we obtained 1400 spectra on 146 OB stars to measure mean systemic radial velocities and radial velocity variations. Of the 120 stars with the most reliable data, 36 are probable and 9 are possible single-lined spectroscopic binaries. We also identify 3 new and 8 candidate double-lined spectroscopic binaries. These data imply a lower limit on the massive binary fraction of 30 42%. The calculated velocity dispersion for Cygnus OB2 is 2.44 +/0.07 km/s, which is typical of open clusters. No runaway OB stars were found.

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