\begin{table}%t1 \caption{\label{T1}The stellar sample. I. Photometric observations.} \par %\centerline {\small \begin{tabular}{lrlrrc} \hline\hline Star & Rot. Per.$^a$ & Sp. type & \multicolumn{1}{c}{$v\sin i$} & \multicolumn{1}{c}{$i$} & \multicolumn{1}{c}{Time-base}\\ & (days) & &\multicolumn{1}{c}{(\kms )} & \multicolumn{1}{c}{(\fok)} & \multicolumn{1}{c}{(years)} \\ \hline AB Dor & 0.515 & K0V & 91 & 60 & 18 \\ LQ Hya & 1.601 & K2V & 27 & 65 & 25 \\ V833 Tau & 1.788 & K5V & 6.3 & 20 & 20 \\ \multicolumn{1}{c}{"} & \multicolumn{4}{l}{photographic + photometric data} & 109\\ V410 Tau & 1.872 & K4 & 74 & 70 & 34 \\ EI Eri & 1.947 & G5IV & 51 & 46 & 28 \\ FK Com & 2.400 & G4III &155 & 60 & 28 \\ V711 Tau & 2.838 & G5IV/K1IV & 41 & 40 & 30 \\ UZ Lib & 4.768 & K0III & 67 & 50 & 17 \\ UX Ari & 6.437 & G5V/K0IV & 39 & 60 & 23 \\ HU Vir & 10.388 & K1IV-III & 25 & 65 & 17 \\ IL Hya & 12.905 & K0III-IV & 26.5 & 55 & 20 \\ XX Tri & 23.969 & K0III & 21 & 60 & 21 \\ HK Lac & 24.428 & K0III & 20 & 65 & 50 \\ IM Peg & 24.649 & K2III-II & 26.5 & 70 & 29 \\ \hline \end{tabular}} \par The stellar parameters are from Strassmeier (\cite{klaus_sum}), and the references therein. $^a$ The orbital period is given in case of synchronised binary. \end{table}