All Figures

$\begin{figure} \par\includegraphics[width=8cm,clip]{5827fig1.ps} \end{figure}$ Figure 1: Surface temperature profiles as a function of the polar angle for different magnetic field configurations according to Eq. (4). We have taken $\mu _1=1.34$ km^-1 and $\mu _2=3.877$ km^-1. The different lines correspond to different relative strengths between the purely dipolar ( $\beta _{\rm d}=1$ ) and purely quadrupolar ( $\beta _{\rm d}=0$ ) models.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{5827fig2.ps} \end{figure}$ Figure 2: Contour plots for a purely dipolar magnetic field, with $n_{\rm H}= 1.33 \times 10^{20}$ cm^-2, $T_{\rm p}=115$ eV and $B_{\rm p}=1.8 \times 10^{13}$ G, of the pulsed fraction for a realistic surface temperature distribution. ${\cal B}$ is the angle between rotation and magnetic axis, and ${\cal O}$ the angle between the rotation axis and the observer direction. The flux has been obtained by integration over the whole surface taking into account General Relativistic light bending effects.
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In the text

$\begin{figure} \par\includegraphics[width=7.6cm,clip]{5827fig3.ps} \end{figure}$ Figure 3: Contour plots of the pulsed fraction for a realistic surface temperature distribution produced by a quadrupole dominated magnetic field ( $\beta _{\rm d}=0.05$ ). The parameters of the model are $T_{\rm p}=115$ eV, $B_{\rm p}=1.8 \times 10^{13}$ G and $n_{\rm H}=1.2\times 10^{20}$ cm^-2. The flux has been obtained by integration over the whole surface taking into account General Relativistic light bending effects.
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In the text

$\begin{figure} \par\includegraphics[width=7.1cm,clip]{5827f4a.ps}\par\includegraphics[angle=270,width=7.1cm,clip]{5827f4b.ps} \end{figure}$ Figure 4: Pulse profiles in two energy bands (soft:0.12-0.4 keV, hard:0.4-1.0 keV) for a realistic model with ${\cal O}=11$ , ${\cal B}=54$ , $T_{\rm p}=115$ eV, $B_{\rm p}=1.8 \times 10^{13}$ G, $n_{\rm H}=1.2\times 10^{20}$ cm^-2 and $\beta _{\rm d}=0.05$ . The third panel is the hardness ratio (HARD/SOFT). The bottom panel shows the observational data corresponding to observation rev. 534. Notice that we have not attempted to perform a fit of the pulse profiles, it is simply a comparison with the model obtained from spectral fitting. In this figure we have taken into account the response matrix of the instrument and the absorption.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{5827f5a.ps}\includegraphics[width=7.5cm,clip]{5827f5b.ps} \end{figure}$ Figure 5: Time variation of the orientation of the magnetic axis, ${\cal B}$ , from the results shown in Tables 5 ( left panel, $\beta _{\rm d}=1$ ) and 7 ( right panel, $\beta _{\rm d}=0.05$ ). The solid line shows the best fit to the data (see text in figure).
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In the text

$\begin{figure} \par\includegraphics[width=7.7cm,clip]{5827fig6.ps} \end{figure}$ Figure 6: Variation of the pulsed fraction with time compared with asinusoidal profile with a periodicity of 7 years.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{5827fig7.ps} \end{figure}$ Figure 7: (Color online) Spectral energy distribution of the best fits of the revolution 534 for phenomenological model (Table 3, black solid), realistic quadrupolar dominated (Table 7, blue solid), and realistic dipole (Table 5, red solid). The phase-averaged spectra of both models are very similar, and it is necessary to analyze the spectral phase evolution to discriminate. The dotted line is the optical tail of the BB model. Solid and dashed lines in the optical band correspond to models with free and frozen ions, respectively. Available optical and UV data (Kaplan et al. 2003) are also shown (crosses) for comparison.
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In the text

$\begin{figure} \par\includegraphics[width=8cm,clip]{5827fig1.ps} \end{figure}$	Figure 1: Surface temperature profiles as a function of the polar angle for different magnetic field configurations according to Eq. (4). We have taken $\mu _1=1.34$ km^-1 and $\mu _2=3.877$ km^-1. The different lines correspond to different relative strengths between the purely dipolar ( $\beta _{\rm d}=1$ ) and purely quadrupolar ( $\beta _{\rm d}=0$ ) models.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{5827f5a.ps}\includegraphics[width=7.5cm,clip]{5827f5b.ps} \end{figure}$	Figure 5: Time variation of the orientation of the magnetic axis, ${\cal B}$ , from the results shown in Tables 5 ( left panel, $\beta _{\rm d}=1$ ) and 7 ( right panel, $\beta _{\rm d}=0.05$ ). The solid line shows the best fit to the data (see text in figure).
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$\begin{figure} \par\includegraphics[width=7.7cm,clip]{5827fig6.ps} \end{figure}$	Figure 6: Variation of the pulsed fraction with time compared with asinusoidal profile with a periodicity of 7 years.
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