ISIS spectrum of the stars J0140+2344, J0401-0512,J1204+1201, J1322+0123 and J2146-0039 (black solid lines) and best fit obtained in this work (red dashed line) performed with ASSET with the set of parameters ⟨ T_eff,log g,[Fe/H] ⟩, [6090, 4.7, −3.6], [5850, 5.0, −3.6], [5850, 3.9, −3.7], [5250, 2.0, −3.7], [6470, 4.9, −3.6], respectively. Two additional synthetic spectra are depicted for J0140+2344: one (green triple-dotted-dashed-line) using T_eff = 5848 K, log g = 4.0, [Fe/H] =−3.83 (Caffau et al. 2013) and other spectrum (blue triple-dotted-dashed-line) T_eff = 5703 K, log g = 4.0, [Fe/H] =−4.00 (Yong et al. 2013). One spectrum for the other objects is shown (blue dotted-dashed line) with values: [5500, 4.0, −3.6] for J0401-0512 (Caffau et al. 2013), [5467, 3.2, −4.34] for J1204+1201 (Placco et al. 2015), [5466, 3.12, −3.32] for J1322+0123 (Placco et al. 2015) and [6475, 4.0, −3.14] for J2146-0039 (Caffau et al. 2013).