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Table 1

Constraints on the distributions of orbital parameters of massive binaries from the literature.

Parameter pdf Domain Variable Value Sample Reference

log 10(P/day) (log 10P)π 0.15−3.5 π −0.55 ± 0.22 Galactic clusters Sana et al. (2012)
0.15−3.5 −0.45 ± 0.30 30 Doradus Sana et al. (2013)
0.0−3.0 0.2 ± 0.4 Cyg OB2 Kiminki & Kobulnicky (2012)

q = M2/M1 q κ 0.1−1.0 κ −0.1 ± 0.6 Galactic clusters Sana et al. (2012)
0.1−1.0 −1.0 ± 0.4 30 Doradus Sana et al. (2013)
0.005−1.0 0.1 ± 0.5 Cyg OB2 Kiminki & Kobulnicky (2012)

e e η 0−0.9 η −0.45 ± 0.17 Galactic clusters Sana et al. (2012)
0−0.9 −0.5 (fixed) 30 Doradus Sana et al. (2013)
0.0001−0.9 −0.6 ± 0.3 Cyg OB2 Kiminki & Kobulnicky (2012)

Binary fraction 69 ± 9% Galactic clusters Sana et al. (2012)
51 ± 4% 30 Doradus Sana et al. (2013)
44 ± 8% Cyg OB2 Kiminki & Kobulnicky (2012)

Binary fraction 85 ± 11% Galactic clusters Sana et al. (2012)
for extrapolated 65 ± 5% 30 Doradus Sana et al. (2013)
period distribution 82 ± 15% Cyg OB2 Kiminki & Kobulnicky (2012)

Notes. The intrinsic binary fractions inferred for these distributions of orbital parameters and their corresponding domain are listed. The intrinsic binary fractions corresponding to an extrapolation of the period distribution to 300 years are also given.

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