\begin{table}%t2
\caption{Stellar parameters and pulsation properties 
of all known pulsating PG~1159 stars. The approximate surface abundances (in~\% by mass) have been derived from Table~\ref{gwvirginis} of Werner \& Herwig (\cite{Wern06})
by assuming a~composition made of~$^{4}$He, $^{12}$C and~$^{16}$O,
except for HS~2324+3944 (data taken from Table~\ref{table2} of Werner \& Herwig \cite{Wern06}) 
and for Abell~43 (data taken from Miksa et~al. \cite{Miks02}).}\label{gwvirginis}
\small%\centerline
{
\begin{tabular}{rccccccrcc}
\hline
\hline
 & & & & & & & & & \\[-8pt]
 Star & $\log (T_{\rm eff})^{a}$ & $\log g^{a}$ & 
$M_*^{b}$ &  H & He & C & O & Remark & Observed period range ($\ell= 1$)\\
& [K] & [cgs] & [$M_{\odot}$]&  &  &  &  & & [s] \\
\hline
 & & & & & & & & & \\[-8pt]
 Abell 43      & 5.041 & 5.7 & 0.53 & 35 & 42 & 23  &  --     & PNNV, hybrid  & $2600{-}3035\ ^{c}$  \\
 HS 2324+3944  & 5.114 & 6.2 & 0.53 & 17 & 35 & 42 &  6 & naked, hybrid &  $2005{-}2569\ ^{d}$ \\
 Longmore 4    & 5.079 & 5.5 & 0.63 & --  & 48 & 43 &  9 & PNNV          & $831{-}2325\ ^{e}$   \\
 NGC 246       & 5.176 & 5.7 & 0.75 & --  & 63 & 31 &  6 & PNNV          & $1460{-}1840\ ^{f}$  \\
 K 1-16        & 5.146 & 6.4 & 0.54 & --  & 33 & 50 & 17 & PNNV          & $1500{-}1700\ ^{g}$  \\
 RX J2117+3412 & 5.230 & 6.0 & 0.72 & --  & 39 & 55 &  6 & PNNV          & $694{-}1530\ ^{h}$   \\
 HE 1429-1209  & 5.204 & 6.0 & 0.66 & --  & 39 & 55 &  6 & naked         & $919\ ^{i}$        \\
 PG 1159-035   & 5.146 & 7.0 & 0.54 & --  & 33 & 50 & 17 & naked         & $430{-}840\ ^{j}$    \\
 PG 2131+066   & 4.978 & 7.5 & 0.55 & --  & 44 & 39 & 17 & naked         & $339{-}598\ ^{k}$    \\
 PG 1707+427   & 4.929 & 7.5 & 0.53 & --  & 44 & 39 & 17 & naked         & $335{-}909\ ^{l}$    \\
 PG 0122+200   & 4.903 & 7.5 & 0.53 & --  & 44 & 39 & 17 & naked         & $336{-}612\ ^{m}$    \\
\hline
\end{tabular}}
\medskip
References: $^{a}$ Werner \& Herwig (\cite{Wern06}); $^{b}$~Miller~Bertolami \& Althaus (\cite{Mill06});
$^{c}$~Vauclair et~al. (\cite{Vauc05}); $^{d}$~Silvotti et~al. (\cite{Silv99}); $^{e}$~Bond \& Meakes (\cite{Bond90}); $^{f}$~Ciardullo \& Bond (\cite{Ciar96}); $^{g}$~Grauer et~al. (\cite{Grau87}); $^{h}$~Vauclair et~al. (\cite{Vauc02}); 
$^{i}$~Nagel \& Werner (\cite{Nage04}); $^{j}$~Winget et~al. (\cite{Wing91}); $^{k}$~Kawaler et~al. (\cite{Kawa95});
$^{l}$~Kawaler et~al. (\cite{Kawa04}); $^{m}$~O'Brien et~al. (\cite{OBri98}). 
\end{table}