Based on observations collected at ESO telescopes under programmes 072.D-0550 and 074.D-0571.

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Tables 4, 6-10, 13, and 14 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/480/79

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... EIS catalogues

Alternative identifications come from Kyeong et al. (2001: ID₁) and Piatti et al. (2004: ID₂) for NGC 2324, from Kassis et al. (1997: ID₁) and the WEBDA (ID₂) for NGC 2477.

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... WEBDA

http://www.univie.ac.at/webda/webda.html

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... IRAF

IRAF is distributed by the National Optical Astronomical Observatory, which are operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation.

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... MOOG

http://verdi.as.utexas.edu/

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... [X/Fe]

We use the usual spectroscopic notation: log n(A) is the abundance (by number) of the element A in the scale where log n(H) = 12; [A/H] is the logarithmic ratio of the abundances of elements A and H in the star, minus the same quantity in the Sun.

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... most

As noted by the referee, the generally higher abundance found for ionized species may be an indication of a weak influence of NLTE (see also the discussion in Allende Prieto et al. 2004).

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...2005)

Given their distance, for these clusters the spectra have rather low S/N.

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...2004)

Some of these OCs have been studied also in other papers but we use only the most comprehensive source. For instance, Be 29 was studied also by Carraro et al. (2004) and their results do not generally differ significantly from the Yong et al. (2005) ones, who however studied more elements.

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... sources

1: Tosi et al. (2007); 2: Bragaglia & Tosi (2006); 3: Kassis et al. (1997); 4: B06; 5: Kyeong et al. (2001).

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... here

For an unfortunate typographical error, Table 3 in B06 lists the H magnitudes instead of the K ones, but the reddening are correctly computed using (V-K).

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... clusters

B: Bragaglia et al. (2006); D: D'Orazi et al. (2006); H: Hasegawa et al. (2004); K: Kassis et al. (1997); KM: Kaluzny & Mazur (1991); Ky: Kyeong et al. (2001); M: Mermilliod et al. (2001); P: Prisinzano et al. (2004); Pi: Piatti et al. (2004); R: Richtler & Sagar (2001); S: Sandrelli et al. (1999); T: Tosi et al. (2007); Tw: Twarog et al. (1997).

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