Distribution of the Gold sample in orbital-parameter space (e, Rmed, zmax), colour-coded by α-element abundance. As expected, α-enhanced stars are on vertically hotter and more eccentric orbits. Also, as previously suggested by Bensby et al. (2011), the density of α-enhanced stars (the “chemical thick disc”) rapidly decreases with Galactocentric orbital radius. This latter result does not appear to depend critically on selection biases.
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