The horizontal branch luminosity vs. metallicity in M 31 globular clusters

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Fig. 6

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M_V(HB) estimates as a function of [Fe/H] (in the ZW84 metallicity scale) for the present sample of 48 M 31 GCs. The line represents the best linear fit as expressed in Eq. (2). The open symbols show the GCs that were excluded from the analysis in Sect. 4 (see Sect. 3.1).

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