\begin{table}%T3
%\centering
\par
 \caption{Logbook of the spectroscopic observations of \hd. Dates,
   incl. Julian date (=HJD-2~400~000), indicate start of night in UT.  
   Column~3 lists the observers: Sterken (S), Hensberge (H) and Freyhammer (F). 
   $N$ is the number of spectra obtained that night, 
   $\Delta t_{\rm exp}$ is the mean integration time (s), "Ins''
   indicates instrument used (FEROS or ECHELEC) and $S/N$ denotes the range of 
   signal-to-noise at 4500~\AA. The last column gives the orbital phase 
   interval covered that night. 
    \label{tab-obslog}
  }
{  \begin{tabular}{@{~~}l@{~~~}l@{~~~}l@{~~~}l@{~~~}l@{~~~}l@{~~~}r@{~~~}l@{~~}}
    \hline
    \hline
    \noalign{\smallskip}
    Date & JD & Obs. &  $N$ & $\Delta t _{\rm exp}$ & Ins. & $S/N$~~ & 
    $\Delta$phase  \\ 
    \hline
    \noalign{\smallskip}
       Feb. 23 1989 & 47~580& S    & 6  & 3360 & EC & 20--25& 0.98--0.00\\
       Feb. 24 1989 & 47~581& S    & 5  & 4631 & EC & 20--35& 0.10--0.13\\
       Feb. 25 1989 & 47~582& S    & 4  & 5738 & EC & 15--30& 0.22--0.26\\
       Feb. 26 1989 & 47~583& S    & 4  & 5400 & EC & 25--35& 0.34--0.46\\
       Feb. 27 1989 & 47~584& S    & 5  & 4223 & EC & 15--20& 0.47--0.49\\
       Feb. 19 2001 & 51~959& H    & 2  & 1200 & FE & 60--70& 0.05--0.05\\
       Feb. 20 2001 & 51~960& H    & 4  & 1200 & FE & 70--85& 0.14--0.15\\
       Mar. 01 2001 & 51~969& H    & 6  & 1200 & FE & 80--100& 0.22--0.24\\
       Mar. 02 2001 & 51~970& H    & 9  & 1233 & FE & 50--90& 0.33--0.37\\
       Mar. 03 2001 & 51~971& H    & 9  & 1200 & FE & 65--110& 0.47--0.50\\
       Feb. 10 2002 & 52~315& H/F  & 16 & 1200 & FE & 40--115& 0.78--0.82\\
       Feb. 11 2002 & 52~316& H/F  & 20 & 1200 & FE & 85--130& 0.90--0.94\\
       Feb. 12 2002 & 52~317& H/F  & 20 & 1204 & FE & 90--160& 0.02--0.06\\
       Feb. 13 2002 & 52~318& H/F  & 17 & 1200 & FE& 105--145& 0.14--0.18\\ 
   \hline
   \end{tabular}}
\end{table}