\begin{table}%t1
\caption{Basic data of the observations for the analysed stars.}
\label{tabella radec}
\small%\centerline
 {
\begin{tabular}{ccccccc}
\hline
\hline
HD & HJD & $M_{\it{v}}$ & Spectral type & SNR & Exp. time & Remarks \\
\hline
\object{72757} & 2454172.336 & 8.45 & F0   & 190 & 3600   &		    \\
\object{72846} & 2454070.737 & 7.48 & A5V  & 210 & 3600   &		    \\
\object{73175} & 2454171.406 & 8.25 & F0Vn & 155 & 3600   & $\delta$Sct      \\
\object{73345} & 2454171.363 & 8.14 & A7V  & 188 & 3600   & $\delta$Sct      \\
\object{73450} & 2454171.494 & 8.59 & A9V  & 185 & 3600   & $\delta$Sct      \\
\object{73574} & 2454171.585 & 7.75 & A8V  & 170 & 3600   &		    \\
\object{73666} & 2454070.682 & 6.61 & A1V  & 326 & 1800   & speckle binary   \\
\object{73746} & 2454172.514 & 8.72 & F0V  & 154 & 3600   & $\delta$Sct      \\
\object{73798} & 2454172.424 & 8.48 & F0V  & 190 & 3600   & $\delta$Sct      \\
\object{73993} & 2454171.450 & 8.56 & F2V  & 134 & 3600   & variable         \\
\object{74028} & 2454171.318 & 7.97 & A7V  & 185 & 3600   & $\delta$Sct      \\
\object{74050} & 2454170.566 & 7.91 & A6Vn & 160 & 3600   & $\delta$Sct      \\
\object{74135} & 2454172.559 & 8.88 & F0   & 120 & 3600   &		    \\
\object{74587} & 2454172.468 & 8.51 & A5   & 177 & 3600   &		    \\
\object{74589} & 2454172.379 & 8.46 & F0   & 200 & 3600   &		    \\
\object{74656} & 2454170.537 & 8.04 & Am   & 226 & 2 $\times$ 3600 & sum of two exposures\\
\object{74718} & 2454171.538 & 8.39 & A5   & 172 & 3600   &		    \\
\hline
\end{tabular}}
\medskip 
The SNR are calculated at $\sim$5500~\AA\ in a bin of 0.5~\AA. 
The exposure time is in seconds. The HJD indicate the Heliocentric Julian Date 
at the middle of the exposure.
\end{table}