Interquartile range of the [O/Na] ratio, IQR[O/Na], for the stars in NGC 1851 as a function of the total absolute visual magnitude (left panel) and of the maximum temperature reached by HB stars (mainly from Recio-Blanco et al. 2006, right panel). NGC 1851 is indicated by a encircled filled point. The large black filled circle and blue square are for M 54 and ω Cen, respectively. The IQR values come from Carretta et al. (2010b) and from data by Johnson & Pilachowski (2010), respectively, and maximum temperatures estimated by Cassisi (2011, priv. comm.). The Spearman rank correlation coefficient (rs) and the linear regression Pearson’s correlation coefficient (rp) are listed in each panel. In the left panel, the green triangle and the orange square indicate the values relative to the MP and MR components in NGC 1851 (see text).
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