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Table 2

Definitions and sizes of useful subsamples of the HQ sample.

Name Requirements Number of stars

HQ sample see Table 1 21 288
HQ sample with reliable α-element abundances 4000 K <Teff < 5000 K 18 855
HQ sample with valid distance determination distance code (Santiago et al. 2014) converges 21 105
HQ sample with (valid) UCAC-4 proper motions PM criteria (see Sect. 3.2) are fulfilled 17 882

HQk sample valid proper motions & distances 17 758
Local HQ sample d < 1 kpc 1975
Local HQk sample d < 1 kpc HQk 1654
Gold sample σ(μ) < 4.0 mas/yr σ(d) /d) < 20% 3984

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