Table 4: Multiplicity among Hipparcos members of Sco OB2. The columns show the subgroup names (Upper Scorpius; Upper Centaurus Lupus; Lower Centaurus Crux), their distances (see de Zeeuw et al. 1999), the ages (de Geus et al. 1989; Preibisch et al. 2002, for US; Mamajek et al. 2002 for UCL and LCC), the number of known single stars, binary stars, triple systems and N>3 systems, and the binary statistics (see Sect. 5.2) .
D Age S B T >3 $F_{\rm M}$ $F_{\rm NS}$ $F_{\rm C}$

(pc) (Myr)

US 145 5-6 63 46 7 3 0.47 0.67 0.61

UCL 140 15-22 131 68 17 4 0.40 0.61 0.52

LCC 118 17-23 112 54 13 0 0.37 0.57 0.45

all 303 171 37 7 0.41 0.61 0.52

**Table 4:** Multiplicity among *Hipparcos* members of Sco OB2. The columns show the subgroup names (Upper Scorpius; Upper Centaurus Lupus; Lower Centaurus Crux), their distances (see de Zeeuw et al. 1999), the ages (de Geus et al. 1989; Preibisch et al. 2002, for US; Mamajek et al. 2002 for UCL and LCC), the number of known single stars, binary stars, triple systems and N>3 systems, and the binary statistics (see Sect. 5.2) .
	D	Age	S	B	T	>3	$F_{\rm M}$	$F_{\rm NS}$	$F_{\rm C}$
	(pc)	(Myr)
US	145	5-6	63	46	7	3	0.47	0.67	0.61
UCL	140	15-22	131	68	17	4	0.40	0.61	0.52
LCC	118	17-23	112	54	13	0	0.37	0.57	0.45
all			303	171	37	7	0.41	0.61	0.52

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Background stars
	4 Properties of the companion stars
	5 Comparison with literature data
	6 Conclusions and discussion
	References
	Online Material