\begin{table}%t2 %\centering \par \caption{\label{tab_obs}A selection of AGB stars with their mass-loss rates and the results.} \begin{tabular}{l l l l l l} \hline\hline \noalign{\smallskip} Source & {\it \.{M}} & Strength & Fo. abun. & Fo. abun.\\ & $(M_{\odot}~{\rm yr}^{-1})$ & 11.3~$\mu$m & 11.3~$\mu$m & Kemper et~al. (2001) \\ & $^{(a)}$ & band & band & \\ \hline IRAS 17010-3840 & ? & 0.14 & $>$12\% & $-$ \\ OH104.91+2.41 & $5.6\times 10^{-5}$ (1) & 0.03 & $<$2\% & $<$5\%\\ OH26.5+0.6 & $16 \times 10^{-5}$ (2) & 0.06 & $\sim$4\% & $<$5\%\\ OH127.8+0.0 & $20 \times 10^{-5}$ (3) & 0.04 & $\sim$2\% & $<$5\%\\ OH30.1-0.7 & $15 \times 10^{-5}$ (4) & 0.10 & $\sim$9\% & $-$\\ OH32.8-0.3 & $16 \times 10^{-5}$ (5) & 0.14 & $>$12\% & $<$5\%\\ \hline \end{tabular} \tablefoot{It lists the strength of the 11.3~$\mu$m band together with the indicated forsterite (fo.) abundance using the 11.3~$\mu$m band. The sources have been selected using the catalog of \citet{sloan03}. The forsterite abundance obtained by \citet{kemper01} has also been included.} \vspace*{-2mm} \tablebib{1: \citet{riechers05}; 2: \citet{just96}; 3: \citet{just92}; 4: \citet{schut89}; 5: \citet{groene94}.} \end{table}