Astronomy & Astrophysics

All Figures

$\begin{figure} \par\includegraphics[width=14.5cm,clip]{0895fig1.eps} \end{figure}$ Figure 1: ${\it UBVRI}$ light curves of BL Lacertae from 1994 to 2002; the numbers on the left indicate the number of data points in the extended BL Lac Campaign 2001 (blue/dark), in the BL Lac Campaign 2000 (red/grey), and from the literature (light cyan/light grey); yellow (shaded) strips correspond to the periods of the 1999 and 2001 WEBT campaigns.
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In the text

$\begin{figure} \par\includegraphics[width=14.8cm,clip]{0895fig2.eps} \end{figure}$ Figure 2: Folded R-band light curve of BL Lacertae from 1997 to 2002; symbols as in Fig. 1.
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In the text

$\begin{figure} \par\includegraphics[width=15.cm,clip]{0895fig3.eps} \end{figure}$ Figure 3: Enlargements of the BL Lacertae R-band light curve corresponding to the WEBT campaigns of late June-early July 1999 ( top panel) and May 2001-February 2002 ( middle and bottom panels); symbols as in Fig. 1; in the top panel the yellow (grey) strip indicates the period of the ASCA pointing.
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In the text

$\begin{figure} \par\includegraphics[width=13cm,clip]{0895fig4.eps} \end{figure}$ Figure 4: An enlargement of the R-band light curve of BL Lacertae on June 29, 1999, corresponding to the green (grey) box in Fig. 3; the yellow (grey) filled circles represent the simultaneous B-band light curve shifted by -1.62 mag.
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In the text

$\begin{figure} \par\includegraphics[width=15cm,clip]{0895fig5.eps} \end{figure}$ Figure 5: B-R ( top panel) and V-I ( middle panel) colour indices versus time from 1997 to 2002 compared to the R-band light curve; the host-galaxy contribution has been removed from the data; symbols as in Fig. 1; the horizontal lines divide each panel into four equal ranges (1 mag for the light curve and 0.25 mag for the colour indices) for clarity.
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In the text

$\begin{figure} \par\includegraphics[width=15cm,clip]{0895fig6.eps} \end{figure}$ Figure 6: An enlargement of the B-R versus time curve ( top panel) compared with the R-band light curve ( bottom panel) during the best-sampled period of the BL Lac Campaign 2001; orange (grey) dots represent the data used for calculating the colour indices.
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In the text

$\begin{figure} \par\includegraphics[width=13cm,clip]{0895fig7.eps} \end{figure}$ Figure 7: B-R colour indices versus R magnitudes after the host-galaxy removal ( upper panel): BL Lac 2000 and literature data are represented by red (grey) and light cyan (light grey) dots, respectively, while BL Lac 2001 extended data are plotted with green (grey) circles (BL Lac 2001 extension), blue (dark) squares (best-sampled period of BL Lac 2001, the same of Fig. 6), and cyan (grey) crosses (remaining part of BL Lac 2001); most of the data lie within a parallelogram whose sides have slopes of 0.1 and 0.4. In the bottom panel the same data have been corrected for the long-term trend as explained in the text.
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In the text

$\begin{figure} \par\includegraphics[width=14.9cm,clip]{0895fig8.eps} \end{figure}$ Figure 8: Galaxy-subtracted R-band flux light curve from 1997 to 2002 (folded, symbols as in Fig. 1); the green (grey) line represents a cubic spline interpolation through the 4-day binned light curve; the blue (dark) line, obtained by normalizing the spline to its minimum value, represents the actual correction factor for removing the long-term trend.
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In the text

$\begin{figure} \par\includegraphics{0895fig9.eps} \end{figure}$ Figure 9: B-R and R-mag curves as obtained after correcting for the long-term trend (symbols as in Fig. 1, horizontal lines as in Fig. 5); the green (grey) line at R = 16.061 in the bottom panel represents the minimum level of the spline (see Fig. 8) to which the light curve has been normalized.
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In the text

$\begin{figure} \par\includegraphics[width=14.5cm,clip]{0895fig1.eps} \end{figure}$	Figure 1: ${\it UBVRI}$ light curves of BL Lacertae from 1994 to 2002; the numbers on the left indicate the number of data points in the extended BL Lac Campaign 2001 (blue/dark), in the BL Lac Campaign 2000 (red/grey), and from the literature (light cyan/light grey); yellow (shaded) strips correspond to the periods of the 1999 and 2001 WEBT campaigns.
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$\begin{figure} \par\includegraphics[width=14.8cm,clip]{0895fig2.eps} \end{figure}$	Figure 2: Folded R-band light curve of BL Lacertae from 1997 to 2002; symbols as in Fig. 1.
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$\begin{figure} \par\includegraphics[width=15.cm,clip]{0895fig3.eps} \end{figure}$	Figure 3: Enlargements of the BL Lacertae R-band light curve corresponding to the WEBT campaigns of late June-early July 1999 ( top panel) and May 2001-February 2002 ( middle and bottom panels); symbols as in Fig. 1; in the top panel the yellow (grey) strip indicates the period of the ASCA pointing.
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$\begin{figure} \par\includegraphics[width=13cm,clip]{0895fig4.eps} \end{figure}$	Figure 4: An enlargement of the R-band light curve of BL Lacertae on June 29, 1999, corresponding to the green (grey) box in Fig. 3; the yellow (grey) filled circles represent the simultaneous B-band light curve shifted by -1.62 mag.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{0895fig5.eps} \end{figure}$	Figure 5: B-R ( top panel) and V-I ( middle panel) colour indices versus time from 1997 to 2002 compared to the R-band light curve; the host-galaxy contribution has been removed from the data; symbols as in Fig. 1; the horizontal lines divide each panel into four equal ranges (1 mag for the light curve and 0.25 mag for the colour indices) for clarity.
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$\begin{figure} \par\includegraphics[width=15cm,clip]{0895fig6.eps} \end{figure}$	Figure 6: An enlargement of the B-R versus time curve ( top panel) compared with the R-band light curve ( bottom panel) during the best-sampled period of the BL Lac Campaign 2001; orange (grey) dots represent the data used for calculating the colour indices.
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$\begin{figure} \par\includegraphics[width=14.9cm,clip]{0895fig8.eps} \end{figure}$	Figure 8: Galaxy-subtracted R-band flux light curve from 1997 to 2002 (folded, symbols as in Fig. 1); the green (grey) line represents a cubic spline interpolation through the 4-day binned light curve; the blue (dark) line, obtained by normalizing the spline to its minimum value, represents the actual correction factor for removing the long-term trend.
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$\begin{figure} \par\includegraphics{0895fig9.eps} \end{figure}$	Figure 9: B-R and R-mag curves as obtained after correcting for the long-term trend (symbols as in Fig. 1, horizontal lines as in Fig. 5); the green (grey) line at R = 16.061 in the bottom panel represents the minimum level of the spline (see Fig. 8) to which the light curve has been normalized.
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