Fig. 1.
Top: B − V colours of the observed stars in the open cluster NGC 2420 plotted as a function of their V magnitude. The best fit GARSTEC isochrones are over-plotted (see text). Stars comprising the final sample are depicted with black asterisks. For selection criteria, see main text. Some of the stars in the kinematically selected sample could be binaries. Bottom: Hertzsprung-Russell diagram of stars for which we performed a detailed spectroscopic analysis.
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