Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-28
Astrophys.J.664:1102-1120,2007
Astronomy and Astrophysics
Astrophysics
56 pages, 23 figures, 5 tables, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/513709
We conducted a radial velocity survey of the Cygnus OB2 Association over a 6 year (1999 - 2005) time interval to search for massive close binaries. During this time we obtained 1139 spectra on 146 OB stars to measure mean systemic radial velocities and radial velocity variations. We spectroscopically identify 73 new OB stars for the first time, the majority of which are likely to be Association members. Spectroscopic evidence is also presented for a B3Iae classification and temperature class variation (B3 - B8) on the order of 1 year for Cygnus OB2 No. 12. Calculations of the intial mass function with the current spectroscopic sample yield Gamma = -2.2 +/- 0.1. 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 +/- km/s, which is typical of open clusters. No runaway OB stars were found.
Berrington Robert Charles
Fryer Christopher L.
Irwin Jennifer S.
Kiminki Daniel. C.
Kinemuchi Karen
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