FORS2/VLT survey of Milky Way globular clusters - I. Description of the method for derivation of metal abundances in the optical and application to NGC 6528, NGC 6553, M 71, NGC 6558, NGC 6426, and Terzan 8

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Table 5

Final average parameters for member stars in each globular cluster and respective internal errors.


Cluster	⟨ v_helio ⟩ (km s^-1)	⟨[Fe/H]⟩^a	⟨[Fe/H]⟩^b	⟨[Fe/H]⟩^avg	⟨[Mg/Fe]⟩^a	⟨[α/Fe]⟩^b


NGC 6528	185 ± 10	−0.07 ± 0.10	−0.18 ± 0.08	−0.13 ± 0.05	0.05 ± 0.09	0.26 ± 0.05
NGC 6553	6 ± 8	−0.125 ± 0.009	−0.55 ± 0.07	−0.133 ± 0.017	0.107 ± 0.009	0.302 ± 0.025
M 71	−42 ± 18	−0.48 ± 0.08	−0.77 ± 0.08	−0.63 ± 0.15	0.25 ± 0.07	0.293 ± 0.032
NGC 6558	−210 ± 16	−0.88 ± 0.20	−1.02 ± 0.05	−1.012 ± 0.013	0.26 ± 0.06	0.23 ± 0.06
NGC 6426	−242 ± 11	−2.03 ± 0.11	−2.46 ± 0.05	−2.39 ± 0.11	0.38 ± 0.06	0.24 ± 0.05
Terzan 8	135 ± 19	−1.76 ± 0.07	−2.18 ± 0.05	−2.06 ± 0.17	0.41 ± 0.04	0.21 ± 0.04

Notes.

^(a)

MILES library;

^(b)

Coelho library;

^(avg)

Average of MILES and Coelho results.

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