\begin{table}%t4
\caption{Stellar parameters used as input for the GASTRoNOoM-code. The
  terminal velocity, $v_{\infty}$, is derived from the CO~lines; the
  stellar radius from the stellar luminosity and temperature. The
  envelope density decreases as $\sim$$r^{-2}$. Literature references
  are given in the footnote.}\label{stellar_parameters}
\small%\centerline
 {
\begin{tabular}{lcccc}
\hline
\hline
& WX Psc & W Aql & II Lup & V Cyg \\
\hline 
%&&&& \\[-8pt]
$T_*$ [K] & 2000$^a$ & 2800 & 2400$^f$ & 1900$^f$ \\
$R_*$ [$10^{13}$~cm] & 5.5 & 2.4 & 3.8 & 5.1 \\
$L_*$ [$10^3$~$L_{\odot}$] & 10$^a$ & 6.8$^b$ & 8.8$^f$ & 6.3$^f$\\
{[CO]}/[H$_2$] [$10^{-4}$] & 3$^c$ & 6$^c$ & 8$^c$ & 8$^c$\\
distance [pc] & 833$^a$ & 230$^d$ & 500$^f$ & 310$^f$ \\
$R_{{\rm inner}}$ [$R_*$] & 5$^a$ & 8$^e$ & 4$^f$ & 2$^f$ \\ 
$v_{\infty}$ [km~s$^{-1}$] & 18 & 17.5 & 21 & 10.5 \\
$\dot{M}$ [$10^{-6}$~$M_{\odot}$~yr$^{-1}$] & 6$^{a, \dagger}$ & 2.5$^b$ & 9$^f$ & 1.2$^g$\\
\hline
\end{tabular}}
\medskip
$^a$ \citet{Decin2007}; $^b$ \citet{Ramstedt2006AetA...454L.103R}; $^c$
\citet{Knapp1985ApJ...292..640K}; $^d$ \citet{Bieging2000ApJ...543..897B}; $^e$ \citet{Danchi1994AJ....107.1469D}; $^f$ \citet{Schoier2006ApJ...649..965S}; $^g$
\citet{schoier2001AetA...368..969S}. \\
$^{\dagger}$ Refers to the inner region~(A) in \citet{Decin2007}.
\end{table}