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We present preliminary results of deep echelle spectrophotometry of a sampleof HII regions along the disk of the Scd galaxy NGC300 obtained with theUltraviolet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope(VLT) with the aim of detect and measure very faint OII and CII permittedlines. We focus this study on the C and O abundances obtained from faintoptical recombination lines (ORLs) instead of the most commonly usedcollisionally excited lines (CELs). We have derived the ionic abundances of C++from the CII 4267 angstrom RL and O++ from the multiplet 1 of OII around 4649angstrom in several objects. Finally, we have computed the radial gradients ofC/H, O/H and C/O ratios in NGC300 from RLs, which has allowed the comparisonwith similar data obtained by our group in other nearby spiral galaxies.

Carbon abundances and radial gradients in NGC300 and other nearby spiral galaxies