\begin{table}%t4
\caption{\label{tab: pulsator}Physical parameters of the known and suspected non-radial pulsators.}
\small%\centerline
 {
\begin{tabular}{cccccc}
\hline\hline
%&&&&& \\[-8pt]
Object & Sp.Type & $\log\frac{L}{L_\odot}$ & $\log T_{\rm eff}$ & $\log g$  & Status$^a$\\
       &         &                         & (K)                    & (cm~s$^{-2})$\\
\hline
HD~93521   & O9.5V   & 4.62 &  4.48 & 3.92    & C\\
$\zeta$~Oph & O9V     & 4.72 &  4.50 & 3.92    & C\\
HD~152219$^b$  & O9.5III & 5.21 &  4.50 & 3.51    & N\\
$\xi$~Per & O7.5III & 5.36 &  4.52 & 3.59    & C\\
HD~152249  & O9I     & 5.54 &  4.47 & 3.23    & S\\
$\lambda$~Cep & O6I     & 5.78 &  4.55 & 3.48    & C\\
$\zeta$~Pup & O5I     & 5.87 &  4.59 & 3.57    & S\\
\hline
\end{tabular}}
\medskip
$^a$ C: confirmed NRPs, S: suspected NRPs, N: no NRP; $^b$~only the  primary component is considered here.
\end{table}