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Fig. 3

image

DARMOUTH isochrones for [Fe/H] = −3.5 and different ages from 16 to 10 Gyr (red dashed lines), blue dashed lines are HB and AGB theoretical tracks for [Fe/H] = −2.5 for two different relative masses (M = 0.6 and M = 1.0). The black diamonds represent the stars of this work and its internal uncertainties derived computed by the FERRE code. The red crosses are the four low-gravity objects explained in Sect. 2. The blue diamonds are bibliography values from Yong et al. (2013), Caffau et al. (2013), Placco et al. (2015) and discussed in Sect. 5.

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