\begin{table}%t1
 \caption{Relevant stellar parameters for \object{Cyg~OB2~No.~9} adopted in
        this paper. The numbers are taken from Bieging~et~al.~(\cite{BAC89}, BAC),
        Leitherer~(\cite{L88}, L) and Herrero~et~al.~(\cite{HCVM99}, HCVM).\label{tab:CygOB2No9}}
%\centerline
{\begin{tabular}{lrl}
        \hline
        \hline
        Parameter & &Ref.\\
        \hline
        $v_{\rm rot} \sin i~({\rm km~s^{-1}})^a$&145&BAC\\
        $T_{\rm eff}~({\rm K})^b$&44\ 500&HCVM\\
        $R_*~({R_{\odot}})$& 22&HCVM\\
        $d~({\rm kpc})$&1.82&BAC\\
        $v_\infty~({\rm km~s^{-1}})$&2\ 900&    L\\
        $\dot{M}~({M_{\odot}\rm ~yr^{-1}})$&$2.0\times 10^{-5}$&L\\
        $L_*~({L_{\odot}})$&$1.74\times 10^6$&HCVM\\
        \hline
\end{tabular}}
\par
\smallskip
$^a$ We follow White~(\cite{W85}) in assuming that
$v_{\rm rot}= 250~{\rm km~s^{-1}}$, which is not in contradiction with the value
for $v_{\rm rot} \sin i$. \\
$^b$ The wind temperature is assumed to be~$0.3$ times the stellar effective
temperature (Drew~\cite{D89}). 
\end{table}