\begin{table}%t9 \caption{\label{tab9}Assumed parameters used in computing the models.} %\centerline {\begin{tabular}{lll} \hline\hline Parameter & Adopted value & Explanation \\ \hline \\[-8pt] $\dot{M}_{{\rm WR}}$ & $1.6\times 10^{-5}$ $M_{\odot}$~yr$^{-1}$ & mass-loss rate$^{{a}}$ \\ $v_{\infty,{\rm WR}}$ & 1785 km~s$^{-1}$ & terminal velocity$^{{b,c}}$ \\ $T_{\ast}$ & 32~000 K & WR temperature$^{{d}}$ \\ $v_{0,{\rm WR}}$ & 60 km~s$^{-1}$ & initial velocity \\ $R_{\ast}^{{\rm WR}}$ & 11.9~$R_{\odot}$ & stellar radius$^{{a}}$ \\ $\dot{M}_{{\rm O}}$ & $2.8\times 10^{-7}$~$M_{\odot}$~yr$^{-1}$ & mass-loss rate$^{{e}}$ \\ $v_{\infty,{\rm O}}$ & 2100 km~s$^{-1}$ & terminal velocity$^{{e}}$ \\ $R_{\ast}^{{\rm O}}$ & 8 to 13~$R_{\odot}$ & stellar radius \\ \\ $i$ & 70\degr or 85\degr & System inclination$^{{a}}$ \\ & & (two test values) \\ \hline \end{tabular}} \par \smallskip $^{{a}}$ Rauw (\cite{rauw97}); $^{{b}}$ Hamann et~al.\ (\cite{hama06}); $^{{c}}$ Crowther et~al.\ (\cite{crow95b});\\ $^{{d}}$ Lamers \& Morris (\cite{lamo94}); $^{{e}}$ Vink et~al.\ (\cite{vink01}). \end{table}