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Fig. 3.

image

Microturbulence velocity values obtained for the sample stars by the ASPCAP pipeline (upper panel) and by our preliminary run with the BACCHUS code (lower panel). Red points indicate stars with [Fe/H] < −1.5 and black points stars with [Fe/H] > −1.5. The dashed line shows the relation derived in the optical by the Gaia-ESO survey assuming Teff = 4500 K and [Fe/H] = −1.5. Both works show a good correspondence with the optical data for the metal-rich stars, but a larger dispersion is obtained for low-metallicity stars.

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