\begin{table}%t1 \caption{\label{tab:sample}Basic data for our stars and observation log.} %\centering \par \begin{tabular}{lcccccccc} \hline\hline \noalign{\smallskip} Star & $V$ & $B-V$ & Sp. type & $P_{\rm rot}$ [days] & First observation & Last observation & \#~nights & $\langle S/N \rangle$\\ \hline \object{HD 4628 } & 5.74 & 0.890 & K2V & 39 & 2003-10-26 & 2008-09-05 & 36 & 34\\ \object{HD 16160} & 5.79 & 0.918 & K3V & 48 & 2003-10-26 & 2008-09-05 & 43 & 28\\ \object{HD 26965A} & 4.43 & 0.820 & K1V & 43 & 2003-10-26 & 2008-09-05 & 38 & 43\\ \object{HD 32147 } & 6.22 & 1.049 & K3V & 47 & 2003-10-26 & 2008-09-05 & 35 & 24\\ \object{HD 152391} & 6.65 & 0.749 & G8V & 11 & 2003-06-18 & 2008-09-11 & 38 & 36\\ \object{HD 160346} & 6.53 & 0.959 & K3V & 37 & 2004-02-10 & 2008-09-11 & 31 & 29\\ \object{HD 216385} & 5.16 & 0.487 & F7IV & 7 & 2003-10-26 & 2008-09-11 & 29 & 56\\ \object{HD 219834A} & 5.20 & 0.787 & G6/G8IV & 42 & 2003-10-26 & 2008-07-09 & 25 & 48\\ \hline \end{tabular} \end{table}