**Table 3:** 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.
Star	$T_{\rm {eff}}$ (K)	[M/H]	C/O^a	$\epsilon \rm (C)-\epsilon (O)$	¹²C/¹³C	$M_{\rm {bol}}$ ^b
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

^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.

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