\begin{table}%t3
\caption{\label{sp_par}Physical parameters of spectroscopically analyzed stars in Mercer~23.}
%\centerline
{\small
\begin{tabular}{cccccccc}
\hline\hline\noalign{\smallskip}
Star & Sp Typ & $\log L$ & $\dot{\cal M}$\tablefootmark{a} & $T_{\rm eff}$ & $\log g$ & $E$($J$$-$$K_{S}$)& ($K_{\rm S}$$-$$M_{K_{\rm S}})_0$\\
 &  & [$L_\odot$]& [${\cal M_\odot}{\rm yr}^{-1}$] & [K]     &          &    & \\
\hline\noalign{\smallskip}
Obj1  & O5.5 I       & 6.21  &   $1.5\times 10^{-5}$ &     35~000     &   3.25    & 1.30 &14.20\\
Obj2  & WNL7-8       & 6.56  &   $2.4\times 10^{-5}$ &     38~000     &   3.00    &	  &     \\
Obj3  & B1/2         & 4.39  &    	       &     32~500     &   4.25    & 1.29 &13.64\\
Obj4  & O9/B0        & 4.65  &    	       &     32~500     &   4.25    & 1.32 &14.55\\
Obj5  & B3/4         &       &    	       &	   &           & 1.38 &14.49\\
Obj6  & O6 If        & 5.86  &   $2.1\times 10^{-5}$ &     34~000     &   3.25    & 1.38 &13.67\\
Obj7  & B3/4         &       &                 &               &           & 1.35 &13.84\\
Obj9  & B1/2         & 4.33  &                 &     30~000     &   4.25    & 1.37 &13.59\\
Obj10 & O9/B0        & 4.72  &                 &     30~000     &   4.25    & 1.39 &14.46\\
Obj11 & O9/B0        & 4.64  &                 &     30~000     &   4.25    & 1.36 &14.36\\
\hline
\end{tabular}}
\tablefoot{\tablefoottext{a}{Only objects 1, 2 and 6 had a modeled wind component providing a mass loss rate The value given in the table corresponds to a smooth wind. H/He ratio, $\beta$ parameter, clumping factor ($f$) and $V_{\infty}$, needed for the wind models and errors, are given in Sect.~4.4.}}
\end{table}