Table 6: Best-fit parameters with formal errors for the binary model.
This work (K band) Hipparcos (V band)

$\rho$ $212.7 \pm 1.5$ mas $255 \pm 39$ mas

$\theta$ $157.6 \pm 1.7$ deg 198 deg

r $50.1 \pm 5.6$ $21.5 \pm 5.9$

$\Delta m$ $4.25 \pm 0.12$ $3.33 \pm 0.31$

$\phi _1$ $21.56 \pm 0.05$ mas

$\phi_2$ 0 (fixed)

$\chi ^{2}_{{\rm r}}$ 2.6

**Table 6:** Best-fit parameters with formal errors for the binary model.
	This work (K band)	Hipparcos (V band)
$\rho$	$212.7 \pm 1.5$ mas	$255 \pm 39$ mas
$\theta$	$157.6 \pm 1.7$ deg	198 deg
r	$50.1 \pm 5.6$	$21.5 \pm 5.9$
$\Delta m$	$4.25 \pm 0.12$	$3.33 \pm 0.31$
$\phi _1$	$21.56 \pm 0.05$ mas
$\phi_2$	0 (fixed)
$\chi ^{2}_{{\rm r}}$	2.6

Source LaTeX | All tables | In the text

	1 Introduction
	2 The interferometric calibration process: The need for well-known calibrators
	3 The observations
	4 Interpretation of the data: Comparison with theoretical atmosphere models
	5 The binary hypothesis
	6 Conclusions and outlook
	References