Open Access

Fig. 20.

image

[α/Fe] as a function of [Fe/H] selected based on the kinematic probabilities of belonging to the thin or thick disc TD/D from kinematics. Colour indicates the estimated age. Analogous to Fig. 19 of Bensby et al. (2014), the abundance plateau of the thick disc and the decrease for thin disc have been plotted in black to guide the eye. While stars with highly thick-disc like kinematics (two upper panels) follow the high-α sequence, numerous stars with thin-disc like kinematics are also seen in the high-α metal-rich regime. However, most stars with thin disc like kinematics (TDD <  0.5 two lower panels) follow the low-α sequence. See Sect. 5 for further discussion.

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