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Table 2
Definitions and sizes of useful subsamples of the HQ sample.
| Name | Requirements | Number of stars |
|
|
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| 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 |
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| 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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