\begin{table}%t1
\caption{\label{logbook}Journal of photometric and spectroscopic observations.}
%\centerline
{\small
\begin{tabular}{lccc}
\hline
\hline\noalign{\smallskip}
\multicolumn{2}{c}{Photometry} & \multicolumn{2}{c}{Spectroscopy} \\
\noalign{\smallskip}\hline\noalign{\smallskip}
Time interval & No.   & Time interval & No. \\
(HJD-2~400~000) &of obs.&(HJD-2~400~000)  &of obs.\\
\noalign{\smallskip}
\hline\noalign{\smallskip}
43~655.6--44~298.7 &   5 & 51~270.7--51~270.9 &  9\\
50~480.8--50~503.7 &  29 & 51~271.7--51~271.8 &  4\\
50~541.7--50~601.6 & 131 & 51~272.5--51~272.9 & 11\\
47~868.5--49~039.5 & 189 & 51~273.5--51~273.9 & 11\\
                 &     & 51~274.5--51~274.9 &  9\\
\hline
\end{tabular}}
\tablefoot{The first three photometric data sets refer to Geneva photometry,
the last one to the Hipparcos $H_{\rm p}$ observations.}
\end{table}