All Figures

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig1.ps} \end{figure}$ Figure 1: Theoretical bolometric light curve ( upper diagram) and displacement of different mass zones ( lower panel) for a BW Vul model with $M=11~M_{\odot}$ , $\log L/L_{\odot}=4.176$ , $\log T_{\rm eff}=4.362$ and Z=0.03.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig2.ps} \end{figure}$ Figure 2: Velocity curves for different mass zones of the BW Vul model Z=0.03. The curves are shifted relative to each other for clarity. The scale is the same for all zones, 30 km s^-1 between two tick marks.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig3.ps} \end{figure}$ Figure 3: Shock propagation through the mass grid. Points mark the maxima of compression corresponding to the most important compression/shock waves. The lower solid curve below corresponds to the middle of the Z-peak region. The two upper solid curves limit the He ionization region. The dashed curve indicates the level of the photosphere.
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In the text

$\begin{figure} \par\includegraphics[angle=-90,width=8.5cm,clip]{0418-fig4.ps} \end{figure}$ Figure 4: Same as in Fig. 3 but versus radius (in $R_\odot$ ).
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig5.ps} \end{figure}$ Figure 5: Time evolution of the profiles of luminosity ( upper diagram), gas pressure ( middle) and velocity ( bottom) versus the number of the mass zone between phases 0.69-0.87, corresponding to the generation of shock 1. Phase 0.69 refers to the thick solid curve, and phase 0.87 to the thin three-dotted curve. Mass zone number 60 approximately corresponds to the Z-peak zone having T=250 000 K, while mass zone 150 corresponds to the top of the atmosphere.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig6.ps} \end{figure}$ Figure 6: Same as Fig. 5 for phases 0.91-1.09, corresponding to the generation of shock 2.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig7.ps} \end{figure}$ Figure 7: The sequences of calculated (solid curves) and observed (dots) profiles of the Si III 4553 Å line for phases 0.239-0.664.
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In the text

$\begin{figure} \par\includegraphics[width=8.1cm,clip]{0418-fig8.ps} \end{figure}$ Figure 8: Same as Fig. 7 for phases 0.687-1.098.
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In the text

$\begin{figure} \par\includegraphics[width=8.1cm,clip]{0418-fig9.ps} \end{figure}$ Figure 9: Theoretical (solid) and observational (points) Full Widths at Half Magnitude of the Si III 4553 Å line. The comparison is presented for all seven consecutive nights, with the dates indicated in each diagram.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig10.ps} \end{figure}$ Figure 10: Same as in Fig. 9 for the residual flux of the principal component. We note that the theory-observation discrepancy in flux is normally less that 0.1, or less than 15%.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig11.ps} \end{figure}$ Figure 11: Same as in Fig. 9 for the radial velocities measured from the minima of the principal absorption component.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig1.ps} \end{figure}$	Figure 1: Theoretical bolometric light curve ( upper diagram) and displacement of different mass zones ( lower panel) for a BW Vul model with $M=11~M_{\odot}$ , $\log L/L_{\odot}=4.176$ , $\log T_{\rm eff}=4.362$ and Z=0.03.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig2.ps} \end{figure}$	Figure 2: Velocity curves for different mass zones of the BW Vul model Z=0.03. The curves are shifted relative to each other for clarity. The scale is the same for all zones, 30 km s^-1 between two tick marks.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig3.ps} \end{figure}$	Figure 3: Shock propagation through the mass grid. Points mark the maxima of compression corresponding to the most important compression/shock waves. The lower solid curve below corresponds to the middle of the Z-peak region. The two upper solid curves limit the He ionization region. The dashed curve indicates the level of the photosphere.
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$\begin{figure} \par\includegraphics[angle=-90,width=8.5cm,clip]{0418-fig4.ps} \end{figure}$	Figure 4: Same as in Fig. 3 but versus radius (in $R_\odot$ ).
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig6.ps} \end{figure}$	Figure 6: Same as Fig. 5 for phases 0.91-1.09, corresponding to the generation of shock 2.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig7.ps} \end{figure}$	Figure 7: The sequences of calculated (solid curves) and observed (dots) profiles of the Si III 4553 Å line for phases 0.239-0.664.
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$\begin{figure} \par\includegraphics[width=8.1cm,clip]{0418-fig8.ps} \end{figure}$	Figure 8: Same as Fig. 7 for phases 0.687-1.098.
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$\begin{figure} \par\includegraphics[width=8.1cm,clip]{0418-fig9.ps} \end{figure}$	Figure 9: Theoretical (solid) and observational (points) Full Widths at Half Magnitude of the Si III 4553 Å line. The comparison is presented for all seven consecutive nights, with the dates indicated in each diagram.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig10.ps} \end{figure}$	Figure 10: Same as in Fig. 9 for the residual flux of the principal component. We note that the theory-observation discrepancy in flux is normally less that 0.1, or less than 15%.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{0418-fig11.ps} \end{figure}$	Figure 11: Same as in Fig. 9 for the radial velocities measured from the minima of the principal absorption component.
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