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Fig. 15.

image

Toomre diagram of the sample from the perspective of the local standard of rest (LSR). Colour indicates the kinematic probability ratio of thick-to-thin disc membership, estimated in Sect. 3.6. For 12 stars (marked as enlarged black dots), the kinematic membership probabilities point to neither thick or thin disc membership, but actually the halo. Dashed circles indicate total velocities in steps of 50 km s−1. The majority of the stars shares similar velocities to the local standard of rest and their kinematic membership ratio TD/D points towards the thin disc. Fewer stars are seen with total velocities above 100 km s−1 and they typically show lower space velocities V. These stars have a significantly higher TD/D ratio, characterising them as thick disc stars.

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