Table 3: The atmospheric parameters of $\alpha$ Cen A and B derived from various methods. The mean $T_{\rm eff}$ is weighted by the inverse variances (see text).
$T_{\rm eff}$ (K) $T_{\rm eff}$ (K) $T_{\rm eff}$ (K) $T_{\rm eff}$ (K) $\log g$ $\log g$ $\rm [Fe/H]$ $\xi _t$ (km s^-1)

excitation H $\alpha$ photometric weighted mean ionization direct

$\alpha$ Cen A 5847 $\pm$ 27 5793 $\pm$ 50 5794 $\pm$ 34 5824 $\pm$ 26 4.34 $\pm$ 0.12 4.307 $\pm$ 0.005 +0.24 $\pm$ 0.03 1.46 $\pm$ 0.03

$\alpha$ Cen B 5316 $\pm$ 28 5155 $\pm$ 100 5182 $\pm$ 19 5223 $\pm$ 62 4.44 $\pm$ 0.15 4.538 $\pm$ 0.008 +0.25 $\pm$ 0.04 1.28 $\pm$ 0.12

**Table 3:** The atmospheric parameters of $\alpha$ Cen A and B derived from various methods. The mean $T_{\rm eff}$ is weighted by the inverse variances (see text).
	$T_{\rm eff}$ (K)	$T_{\rm eff}$ (K)	$T_{\rm eff}$ (K)	$T_{\rm eff}$ (K)	$\log g$	$\log g$	$\rm [Fe/H]$	$\xi _t$ (km s^-1)
	excitation	H $\alpha$	photometric	weighted mean	ionization	direct
$\alpha$ Cen A	5847 $\pm$ 27	5793 $\pm$ 50	5794 $\pm$ 34	5824 $\pm$ 26	4.34 $\pm$ 0.12	4.307 $\pm$ 0.005	+0.24 $\pm$ 0.03	1.46 $\pm$ 0.03
$\alpha$ Cen B	5316 $\pm$ 28	5155 $\pm$ 100	5182 $\pm$ 19	5223 $\pm$ 62	4.44 $\pm$ 0.15	4.538 $\pm$ 0.008	+0.25 $\pm$ 0.04	1.28 $\pm$ 0.12

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