Table 4: Properties of $\delta$ Vel Aa, Ab and B derived from their V and K band magnitudes using the surface brightness-color relations from Kervella et al. (2004). The bolometric corrections for the V band were taken from Bessell et al. (1998). The approximate masses of the three stars are discussed in Sect. 5.
Star $\theta_{\rm LD}$ (mas) Radius ( $R_\odot$ ) $T_{\rm eff}$ (K) M_V BC_V $M_{\rm bol}$ $L/L_\odot$ Spect. $M/M_\odot$

Aa $1.21 \pm 0.03$ $3.17 \pm 0.08$ $9000 \pm 400$ $0.39 \pm 0.04$ -0.07 $0.32 \pm 0.04$ $59.2 \pm 2.0$ A2IV $2.5 \pm 0.1$

Ab $0.77 \pm 0.02$ $2.02 \pm 0.05$ $8600 \pm 350$ $1.50 \pm 0.04$ 0.00 $1.50 \pm 0.04$ $20.0 \pm 0.7$ A4V $2.0 \pm 0.1$

B $0.53 \pm 0.02$ $1.39 \pm 0.06$ $6350 \pm 350$ $3.60 \pm 0.04$ 0.00 $3.60 \pm 0.04$ $3.1 \pm 0.2$ F8V $1.3 \pm 0.1$

**Table 4:** Properties of $\delta$ Vel Aa, Ab and B derived from their V and K band magnitudes using the surface brightness-color relations from Kervella et al. (2004). The bolometric corrections for the V band were taken from Bessell et al. (1998). The approximate masses of the three stars are discussed in Sect. 5.
Star	$\theta_{\rm LD}$ (mas)	Radius ( $R_\odot$ )	$T_{\rm eff}$ (K)	M_V	BC_V	$M_{\rm bol}$	$L/L_\odot$	Spect.	$M/M_\odot$
Aa	$1.21 \pm 0.03$	$3.17 \pm 0.08$	$9000 \pm 400$	$0.39 \pm 0.04$	-0.07	$0.32 \pm 0.04$	$59.2 \pm 2.0$	A2IV	$2.5 \pm 0.1$
Ab	$0.77 \pm 0.02$	$2.02 \pm 0.05$	$8600 \pm 350$	$1.50 \pm 0.04$	0.00	$1.50 \pm 0.04$	$20.0 \pm 0.7$	A4V	$2.0 \pm 0.1$
B	$0.53 \pm 0.02$	$1.39 \pm 0.06$	$6350 \pm 350$	$3.60 \pm 0.04$	0.00	$3.60 \pm 0.04$	$3.1 \pm 0.2$	F8V	$1.3 \pm 0.1$

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