\begin{table}%t1
\caption{Basic parameters of program stars.}\label{tab1}
%\centerline
{
\begin{tabular}{lccl}
\hline\hline
Star & $P_0$ (days) & $P_1 / P_0$ & Reference \\
\hline
Y Car & 3.6398 & 0.7032 & PP \\
EY Car & 2.8760 & 0.7079 & WO \\
GZ Car & 4.1589 & 0.7054 & PP \\
TU Cas$^a$ & 2.1393 & 0.7097 & PP \\
UZ Cen & 3.3343 & 0.7064 & PP \\
BK Cen & 3.1739 & 0.7004 & PP \\
VX Pup & 3.0118 & 0.7104 & PP \\
EW Sct & 5.8235 & 0.6986 & PP \\
V367 Sct & 6.2932 & 0.6968 & PP \\
V458 Sct & 4.8412 & 0.6993 & A \\
BQ Ser &  4.2710 & 0.7052 & PP \\
U TrA & 2.5684 & 0.7105 & PP \\
AP Vel & 3.1278 & 0.7033 & PP \\
AX Vel & 3.6732 & 0.7059 & PP \\
GSC 8691-1294 & 4.317 & 0.7035 & WO \\
GSC 8607-0608 & 4.089 & 0.7017 & WO \\\\
V1048 Cen$^b$ & 0.9224 & 0.8058 & BP \\
\hline
\end{tabular}}
\smallskip
$^a$ Data obtained at DDO; 
$^b$ 1st/2nd overtone pulsator.    References: A: Antipin (\cite{ant97});  BP: Beltrame \& Poretti (\cite{bp}); PP: Pardo \& Poretti (\cite{pp}); WO: Wils \& Otero (\cite{wo04}).
\end{table}