A1 Refereed original research article in a scientific journal
FIVE MORE MASSIVE BINARIES IN THE CYGNUS OB2 ASSOCIATION
Authors: Kiminki DC, Kobulnicky HA, Gilbert I, Bird S, Chunev G
Publisher: IOP PUBLISHING LTD
Publication year: 2009
Journal: Bulletin of the American Astronomical Society
Journal name in source: ASTRONOMICAL JOURNAL
Journal acronym: ASTRON J
Volume: 137
Issue: 6
First page : 4608
Last page: 4620
Number of pages: 13
ISSN: 0004-6256
DOI: https://doi.org/10.1088/0004-6256/137/6/4608
Web address : http://adsabs.harvard.edu/abs/2009AJ....137.4608K
Abstract
We present the orbital solutions for four OB spectroscopic binaries, MT145, GSC 03161-00815, 2MASS J20294666+4105083, and Schulte 73, and the partial orbital solution to the B spectroscopic binary, MT372, as part of an ongoing study to determine the distribution of orbital parameters for massive binaries in the Cygnus OB2 Association. MT145 is a new, single-lined, moderately eccentric (e = 0.291 +/- 0.009) spectroscopic binary with period of 25.140 +/- 0.008 days. GSC 03161-00815 is a slightly eccentric (e = 0.10 +/- 0.01), eclipsing, interacting and double-lined spectroscopic binary with a period of 4.674 +/- 0.004 days. 2MASSJ20294666+4105083 is a moderately eccentric (e = 0.273 +/- 0.002) double-lined spectroscopic binary with a period of 2.884 +/- 0.001 days. Schulte 73 is a slightly eccentric (e = 0.169 +/- 0.009), double-lined spectroscopic binary with a period of 17.28 +/- 0.03 days and the first "twin" in our survey with a mass ratio of q = 0.99 +/- 0.02. MT372 is a single-lined, eclipsing system with a period of 2.228 days and low eccentricity (e similar to 0). Of the now 18 known OB binaries in Cyg OB2, 14 have periods and mass ratios. Emerging evidence also shows that the distribution of log(P) is flat and consistent with "Opik's Law."
We present the orbital solutions for four OB spectroscopic binaries, MT145, GSC 03161-00815, 2MASS J20294666+4105083, and Schulte 73, and the partial orbital solution to the B spectroscopic binary, MT372, as part of an ongoing study to determine the distribution of orbital parameters for massive binaries in the Cygnus OB2 Association. MT145 is a new, single-lined, moderately eccentric (e = 0.291 +/- 0.009) spectroscopic binary with period of 25.140 +/- 0.008 days. GSC 03161-00815 is a slightly eccentric (e = 0.10 +/- 0.01), eclipsing, interacting and double-lined spectroscopic binary with a period of 4.674 +/- 0.004 days. 2MASSJ20294666+4105083 is a moderately eccentric (e = 0.273 +/- 0.002) double-lined spectroscopic binary with a period of 2.884 +/- 0.001 days. Schulte 73 is a slightly eccentric (e = 0.169 +/- 0.009), double-lined spectroscopic binary with a period of 17.28 +/- 0.03 days and the first "twin" in our survey with a mass ratio of q = 0.99 +/- 0.02. MT372 is a single-lined, eclipsing system with a period of 2.228 days and low eccentricity (e similar to 0). Of the now 18 known OB binaries in Cyg OB2, 14 have periods and mass ratios. Emerging evidence also shows that the distribution of log(P) is flat and consistent with "Opik's Law."
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