Based on observations carried out at the European Southern Observatory, Paranal and La Silla, PIDs 68.D-0181, 69.D-0015, 71.D-0127, 72.D-0159, 73.D-0139, and on observations collected at the Centro Astronómico Hispano Alemán (CAHA) at Calar Alto, operated jointly by the Max-Planck Institut für Astronomie and the Instituto de Astrofísica de Andalucía (CSIC).

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Appendices A and B are only available in electronic form at http://www.edpsciences.org

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...

Marie Curie Outgoing International Fellow.

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... publications

It should be noted that the FLAMES/UVES targets observed in open cluster fields are not necessarily cluster members, as was shown for example for Cl* IC 4665 V 102 in Reiners et al. (2005). A detailed investigation of cluster membership goes beyond the scope of this analysis; rotation velocity and spectral type make them sufficiently comparable to the (probable) field stars in this context.

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...

It should be noted that the only star in this group, that lies on the cool side of the convection boundary, is Cl* IC 4665 V 102. Temperature and luminosity were estimated from B-V color using ZAMS polynomials. Cl* IC 4665 V 102, however, is not a member of the cluster IC 4665 (Reiners et al. 2005), hence its position in the HR-diagram is most uncertain. It may have a much higher absolute luminosity that shifts it even closer towards the convection boundary.

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