Fig. 8
Left panel: abundances of C, O, and Na versus effective temperature. The dotted line corresponds to the solar value and the dashed line to the mean value determined for the F stars of the cluster. Right panel: [C/Fe], [O/Fe], and [Na/H] versus [Fe/H]. The filled dots correspond to normal A stars, the open squares correspond to Am stars, and the filled diamonds to F stars. In the plot representing [Na/H] versus [Fe/H], the dashed line corresponds to the solar [Na/Fe] ratio. The error bars in the right panel represent the mean standard deviation for the displayed abundances.
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