Table 5: Stellar and layer parameters for $\alpha $ Orionis, as derived by Jennings & Sada (1998), Tsuji (2000b), Ohnaka (2004b) and Perrin et al. (2004a). The first 2 determinations are purely spectroscopic, the third combines high-resolution spectroscopy and interferometry and the fourth one combines photometry with interferometry (NA = not available).
Parameter Jennings & Sada (1998) Tsuji (2000b) Ohnaka (2004b) Perrin et al. (2004a) This work
$\theta_{\star}$ [mas] NA NA 44.0 $42.00\pm 0.06$ 45.6
$T_{\star}$ [K] NA 3600 3600 $3690 \pm 50$ 3600
$\theta_{\rm {layer}}$ [mas] NA NA $63.8 \pm 6.4$ $55.78\pm 0.04$ 65
$T_{\rm {layer}}$ [K] ${\le}2800$ $1500 \pm 500$ $2050 \pm 100$ $2055 \pm 25$ 1750
Layer Composition H2O H2O H2O undefined H2O, Al2O3(?)
K, opacity NA NA NA $0.060\pm0.003$ NA
L opacity NA NA NA $0.026\pm0.002$ NA
11 $\mu $m opacity NA NA NA $2.33\pm0.23$ NA
H2O col. d. [cm-2] $3\pm2 \times 10^{18}$ ${\sim} 1 \times 10^{20}$ $1{-}4 \times 10^{20}$ NA $2 \times 10^{19}$


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