The VLT-FLAMES Tarantula Survey - VIII. Multiplicity properties of the O-type star population

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Table 6

Observed fraction of RV variables and binaries among different O star populations in 30 Dor.

Population (size)	RV variables (Eq. (1))	Binaries (Eq. (4))
C (km s^-1)	0.0	20.0

Overall (360)	0.458 ± 0.026	0.350 ± 0.025
NGC 2070^a (184)	0.429 ± 0.036	0.332 ± 0.035
NGC 2060^b (73)	0.562 ± 0.058	0.384 ± 0.057
Remaining^c (103)	0.437 ± 0.049	0.359 ± 0.047

Notes.

^(a)

Defined as a 2.4′ radius around R136 (α = 05:38:42.0, δ = −69:06:02).

^(b)

Defined as a 2.4′ radius around α = 05:37:45.0, δ = −69:10:15.

^(c)

All stars not included in NGC 2060 nor NGC 2070.

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