\begin{table} %T3 
\caption{Main characteristics of the extragalactic C-stars.
We give the stellar name, the effective temperature, the mean
metallicity   [M/H], the carbon over oxygen abundances ratio (C/O),
the corresponding difference between carbon and oxygen
abundances  ($\epsilon\rm (C)-\epsilon(O)$), the carbon isotopic ratio
and the range of estimated bolometric absolute magnitudes.
}             
\label{t3} 
%\centerline
{
\begin{tabular}{c c c c c c c}     % 6 columns 
\hline\hline       
Star & $T_{\rm{eff}}$(K) & [M/H] & C/O$^a$  & $\epsilon\rm (C)-\epsilon(O)$&$^{12}$C/$^{13}$C & $M_{\rm{bol}}$$^b$\\ 
\hline                     
   IGI95-C1 & 3300 & $-$0.80 & 1.18--1.06&7.23& 25     & $-3.1$, $-3.3$ \\
   IGI95-C3 & 2900 & $-$0.50 & 1.10--1.05&7.33&40     & $-4.5$, $-4.5$ \\
   BMB-B~30& 3000 & $-$1.00 & 1.20--1.09 &7.35&$>$300 & $-5.6$, $-5.1$\\
\hline                  
\end{tabular}}
\medskip
$^a$ The C/O~ratios indicate the range of values estimated from the
analysis of the different spectral ranges (see text).\\
$^b$ The first value indicates the
luminosity obtained from $M_{K}$ according to the calibration by Alknis et~al. (1998). The second one 
was derived after the bolometric correction by Wood et~al.
(1983). See Sect.~2 for more details.
\end{table}