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Fig. 12

image

[α/Fe] ratio as a function of [Fe/H] in the GCS kinematic group of stars, in the Arcturus stream (green diamonds), in the AF06 stream (blue empty diamonds), and in the Hercules stream (orange diamonds and crosses). The data for Arcturus and AF06 streams were taken from Ramya et al. (2012), for the Hercules stream from Soubiran & Girard (2005) and Bensby et al. (2014). The averaged values for α-elements consist of Mg, Si, Ca, and Ti abundances. A thin-disc model (continuous line) is taken from Pagel & Tautvaišienė (1995), the 2nd order polynomial fit to the GCS data is shown by the dashed line.

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