A Radial Velocity Survey of the Cyg OB2 Association

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dc.contributor.author Kiminki, Daniel C.
dc.contributor.author Kobulnicky, Henry A.
dc.contributor.author Kinemuchi, K.
dc.contributor.author Irwin, Jennifer S.
dc.contributor.author Fryer, Christopher L.
dc.contributor.author Berrington, Robert C.
dc.contributor.author Uzpen, B.
dc.contributor.author Monson, Andy J.
dc.contributor.author Pierce, Michael J.
dc.contributor.author Woosley, S.E.
dc.date.accessioned 2020-01-23T18:20:51Z
dc.date.available 2020-01-23T18:20:51Z
dc.date.issued 9/27/2006
dc.identifier.citation Kiminki, Daniel & Kobulnicky, Henry & Kinemuchi, K. & Irwin, Jennifer & Fryer, Christopher & Berrington, Robert & Uzpen, Brian & Monson, Andy & Pierce, Michael & Woosley, and. (2008). A Radial Velocity Survey of the Cyg OB2 Association. The Astrophysical Journal. 664. 1102. 10.1086/513709. https://iopscience.iop.org/article/10.1086/513709/meta en_US
dc.identifier.uri http://cardinalscholar.bsu.edu/handle/123456789/202068
dc.description.abstract We conducted a radial velocity survey of the Cyg OB2 association over a 6 yr (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 B3 Iae classification and temperature class variation (B3-B8) on the order of 1 yr for Cyg OB2 No. 12. Calculations of the initial mass function with the current spectroscopic sample yield Γ = -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 three new and eight candidate double-lined spectroscopic binaries. These data imply a lower limit on the massive binary fraction of 30%-42%. The calculated velocity dispersion for Cyg OB2 is 2.44 ± 0.07 km s-1, which is typical of open clusters. No runaway OB stars were found. en_US
dc.format.mimetype application/pdf
dc.relation.isversionof https://iopscience.iop.org/article/10.1086/513709/meta en_US
dc.source.uri https://iopscience.iop.org/article/10.1086/513709/meta
dc.subject binaries: close en_US
dc.subject binaries: general en_US
dc.subject binaries: spectroscopic en_US
dc.subject stars: early-type en_US
dc.subject stars: kinematics en_US
dc.subject surveys en_US
dc.subject techniques: radial velocities en_US
dc.title A Radial Velocity Survey of the Cyg OB2 Association en_US
dc.type Article en_US
dc.rights.holder (c) 2007. The American Astronomical Society.

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