All Figures

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig1.eps}} \end{figure}$ Figure 1: Observational constraints in the HR diagram for $\alpha$ Cen A and B. The dashed lines indicate the boxes delimited by the observed luminosities and effective temperatures (with their respective 1-sigma errors). The continuous lines denote the boxes delimited by the observed radii with their 1-sigma errors, while the dotted line correspond to the same observed radii with errors of 2 sigma. The positions in the HR diagram of $\alpha$ Cen A and B for the M1 model is indicated by the two triangles, while the dots correspond to the positions of the M2 model. Note that for $\alpha$ Cen B the dot and the triangle are partly superimposed, because the M1 model is only slightly hotter and less luminous than the M2 model.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig2.eps}} \end{figure}$ Figure 2: Large spacing versus frequency for $\alpha$ Cen A and B for the model with 1-sigma error boxes on the observed radii (model M1). The dots indicate the observed values of the large spacing with an uncertainty on individual frequencies estimated to half the time resolution (0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig3.eps}} \end{figure}$ Figure 3: Differences between calculated and observed frequencies for the model with 1-sigma error boxes on the observed radii (model M1). The systematic shifts for $\alpha$ Cen A and B are $\langle D_{\nu}\rangle_{{\rm A}}=-11.5$ $\mu$ Hz and $\langle D_{\nu}\rangle_{{\rm B}}=13.7$ $\mu$ Hz (see text for more details).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig4.eps}} \end{figure}$ Figure 4: Differences between calculated and observed frequencies for the model with 2-sigma error boxes on the observed radii (model M2). The systematic shifts between theoretical and observed frequencies for $\alpha$ Cen A and B are $\langle D_{\nu}\rangle_{{\rm A}}=-19.0$ $\mu$ Hz and $\langle D_{\nu}\rangle_{{\rm B}}=0.7$ $\mu$ Hz (see text for more details).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig5.eps}} \end{figure}$ Figure 5: Large and small spacings versus frequency for $\alpha$ Cen A for the model with 2-sigma error boxes on the observed radii (model M2). The dots indicate the observed values of the large and small spacings with an uncertainty on individual frequencies estimated to half the time resolution (0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig6.eps}} \end{figure}$ Figure 6: Large and small spacings versus frequency for $\alpha$ Cen B for the M2 model. The dots indicate the observed values of the large and small spacings with an uncertainty on individual frequencies estimated to 0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig7.eps}} \end{figure}$ Figure 7: $\delta \nu _{01}$ spacing versus frequency for $\alpha$ Cen A for the M2 model. The uncertainty on the observed individual frequencies is estimated to 0.46 $\mu$ Hz.
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig8.eps}} \end{figure}$ Figure 8: Echelle diagram of $\alpha$ Cen A for the best model of the $\alpha$ Cen system (model M2), with a large spacing $\Delta \nu =105.5$ $\mu$ Hz. Open symbols refer to theoretical frequencies, while the filled circles correspond to the frequencies observed by Bouchy & Carrier (2002). Open circles are used for modes with l=0, triangles for l=1, squares for l=2 and pentagons for l=3 (see text for more details).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig9.eps}} \end{figure}$ Figure 9: Echelle diagram of $\alpha$ Cen B for the best model of the $\alpha$ Cen system (model M2), with a large spacing $\Delta \nu =161.1$ $\mu$ Hz. Open symbols refer to theoretical frequencies, while the filled circles correspond to the frequencies observed by Carrier & Bourban (2003). Open circles are used for modes with l=0, triangles for l=1, squares for l=2 and pentagons for l=3 (see text for more details).
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In the text

$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig2.eps}} \end{figure}$	Figure 2: Large spacing versus frequency for $\alpha$ Cen A and B for the model with 1-sigma error boxes on the observed radii (model M1). The dots indicate the observed values of the large spacing with an uncertainty on individual frequencies estimated to half the time resolution (0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively).
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$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig3.eps}} \end{figure}$	Figure 3: Differences between calculated and observed frequencies for the model with 1-sigma error boxes on the observed radii (model M1). The systematic shifts for $\alpha$ Cen A and B are $\langle D_{\nu}\rangle_{{\rm A}}=-11.5$ $\mu$ Hz and $\langle D_{\nu}\rangle_{{\rm B}}=13.7$ $\mu$ Hz (see text for more details).
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$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig4.eps}} \end{figure}$	Figure 4: Differences between calculated and observed frequencies for the model with 2-sigma error boxes on the observed radii (model M2). The systematic shifts between theoretical and observed frequencies for $\alpha$ Cen A and B are $\langle D_{\nu}\rangle_{{\rm A}}=-19.0$ $\mu$ Hz and $\langle D_{\nu}\rangle_{{\rm B}}=0.7$ $\mu$ Hz (see text for more details).
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$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig5.eps}} \end{figure}$	Figure 5: Large and small spacings versus frequency for $\alpha$ Cen A for the model with 2-sigma error boxes on the observed radii (model M2). The dots indicate the observed values of the large and small spacings with an uncertainty on individual frequencies estimated to half the time resolution (0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively).
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$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig6.eps}} \end{figure}$	Figure 6: Large and small spacings versus frequency for $\alpha$ Cen B for the M2 model. The dots indicate the observed values of the large and small spacings with an uncertainty on individual frequencies estimated to 0.46 and 0.47 $\mu$ Hz for $\alpha$ Cen A and B respectively.
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$\begin{figure} \par\resizebox{8.8cm}{!}{\includegraphics{0203fig7.eps}} \end{figure}$	Figure 7: $\delta \nu _{01}$ spacing versus frequency for $\alpha$ Cen A for the M2 model. The uncertainty on the observed individual frequencies is estimated to 0.46 $\mu$ Hz.
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