... Cen)

Table 2 is only available in electronic form at http://www.edpsciences.org

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... width

The equivalent width divided by the wavelength of the transition.

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... IRAF

Distributed by the National Optical Astronomy Observatories.

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... temperature

For the global system, two effective temperatures were derived, one from the B-V index, the other from the V-I index.

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... wavelength

The observed spectrum wavelength are corrected for the radial velocity shift.

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... ELODIE

In operation on the 193 cm telescope from the Haute-Provence observatory.

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... star

The gravities derived from the isochrones, for a 4570 K clump star, are $\log g = 2.4$ and 2.3 respectively for 5 and 10 Gyr.

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