Metallicity parameter ζTiO / CaH vs. [Fe/H] for G 224-58 B and M subdwarfs from Woolf & Wallerstein (2006), Woolf et al. (2009). The blue dashed line represents the fitting from Woolf et al. (2009). The black solid line represents our fitting of G 224-58 B and data from Woolf & Wallerstein (2006), Woolf et al. (2009). The fit can be described with [ Fe / H ] = 2.004 × ζTiO / CaH − 1.894. Red dotted lines shows the boundaries of metallicity classes of M dwarfs from Lépine et al. (2007).
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