Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association - I. The multiplicity of O-type stars

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Volume 502 / No 3 (August II 2009)

A&A, 502 3 (2009) 937-950

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Table 8:

Summary of the multiplicity in young open clusters^a.
Cluster	Density	Minimal binary	n# O-stars	Short-period	Long-period	Variable	References
	(stars/pc²)	fraction		binaries (P $\le$ 10)	binaries	stars
NGC 2244	2.84	17%	6	0	1	3	This paper
IC 1805	1.65	20%	10	1	1	4 $^{\star}$	Rauw & De Becker (2004)
							De Becker et al. (2006)
NGC 6231	12.46	63%	16	6 $^{\star \star}$	4	3	Sana et al. (2008)

^a The first and second columns give the name and the density of the cluster. The third column provides the minimal binary fraction determined after intensive monitoring of the O-type stars. The next columns present the number of O-stars in each cluster, and the number of detected short and long-period binaries and the variable stars (potential binaries and probable intrinsic variables). The last column quotes relevant references. $^{\star}$ Notes: four late O-type stars were not studied by the two papers mentioned in the references. We will consider these objects as variable in the absence of a thorough study. $^{\star \star}$ Notes: we take into account that NGC 6231 also contains a WR+O binary since a WR is an evolved O-star.

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