Table 3: Br$\gamma $ visibilities measured in the continuum ($V_{\rm c}$) and visibility drop within the Br$\gamma $ line ($V_{\rm r}$/$V_{\rm c}$). $V_{\rm r}$ calculated from the measured $V_{\rm c}$ and $V_{\rm r}$/$V_{\rm c}$ ratio. The deduced envelope contribution in the continuum ( $V_{\rm ec}$) and in the line ( $V_{\rm er}$) is given for each baseline. The corresponding angular diameters in the Br$\gamma $ line ( $\phi _{\rm er}$) and the nearby continuum ( $\phi _{\rm ec}$) are computed using a uniform disk model for each envelope measurement. The corresponding extension in stellar radii are also given, assuming a 6 $R_\odot $ star at 230 pc.
Base n$^\circ$ 1 2 3
Baseline UT2-3 UT3-4 UT2-4
Length (m) 42.7 59.3 80.8
PA ( $\hbox {$^\circ $ }$) 51.6 128 97.1
$V_{\rm c}$ >0.93 >0.93 >0.93
$V_{\rm r}$/$V_{\rm c}$ $0.93\pm0.02$ $0.95\pm0.02$ $0.9\pm0.02$
$V_{\rm r}$ $0.85< V_{\rm r} <0.95$ $0.87< V_{\rm r}<0.97$ $0.82<V_{\rm r}<0.92$
$V_{\rm ec}$ >0.86 >0.86 >0.86
$V_{\rm er}$ $0.69<V_{\rm er}<0.85$ $0.75<V_{\rm er}<0.91$ $0.60<V_{\rm er}<0.76$
$\phi$$_{\rm ec}$ (mas) <3.6 <2.6 <1.9
$\phi$$_{\rm er}$ (mas) $3.7< \phi_{\rm er} <5.5$ $2.0< \phi_{\rm er} <3.6$ $2.6< \phi_{\rm er} <3.4$
$\phi$$_{\rm ec}$ (D$_\star$) <15.5 <11.2 <8.2
$\phi$$_{\rm er}$ (D$_\star$) $15.9< \phi_{\rm er} <23.7$ $8.6< \phi_{\rm er} <15.4$ $11.2< \phi_{\rm er}<14.6$


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