All Tables

Table 1: Log of the observations of $\delta$ Vel and its calibrators, HD 82668, HD 67582 and HD 80007 with VISIR. MJD^* is the modified Julian date of the middle of the exposures on the target, minus 54 580. The Detector Integration Time (DIT) is given in milliseconds for one BURST image. $\theta$ is the seeing in the visible ( $\lambda=0.5~\mu$ m) as measured by the observatory DIMM sensor, in arcseconds. N exp. is the number of selected and averaged exposures. The airmass (AM) is the average airmass of the observation.
Table 2: Log of the observations of $\delta$ Vel with NACO in the NB2.17 filter. MJD^* is the average modified Julian date minus 54 000, HJD^* the heliocentric Julian date minus 2 454 000 and $\phi$ is the phase of the eclipsing binary (see text). N is the number of frames. As in Table 1, $\theta$ is the seeing in the visible and AM is the airmass. The listed figures are median values over the observations.
Table 3: Measured thermal IR irradiances of $\delta$ Vel A and B in S.I. units and in Jy. The relative uncertainty $\sigma$ on the irradiance values is listed in the last column.
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.
Table 5: Observed fluxes and excesses of $\delta$ Vel compared to the Castelli & Kurucz (2003) models. $N\sigma$ is the measured excess expressed in number of times the measurement uncertainty.