Table 2
Radial velocity distributions of different sub-samples.
| Selection | N | ⟨RV⟩ (km s-1) | σRV (km s-1) |
|
|
|||
| Observations | |||
| whole sample | 401 | −8.3 ± 3.8 | 76.1 ± 2.7 |
| μ < 20 mas | 341 | −8.9 ± 4.2 | 77.1 ± 3.0 |
| bright RC | 96 | −10.4 ± 7.3 | 71.6 ± 5.2 |
| bright RC, weighted | 96 | −10.3 ± 7.3 | 71.3 ± 5.2 |
| faint RC | 150 | −6.0 ± 6.1 | 74.1 ± 4.3 |
| faint RC, weighted | 150 | −5.1 ± 6.1 | 73.5 ± 4.1 |
| metal-rich third | 128 | −7.1 ± 4.6 | 52.3 ± 3.3 |
| metal-poor third | 128 | −5.4 ± 8.0 | 90.6 ± 5.7 |
| metal-rich pop.1 | 88 | −6.1 ± 5.3 | 47.7 ± 5.6 |
| metal-poor pop.1 | 198 | −9.1 ± 6.4 | 90.3 ± 6.5 |
|
|
|||
| Besançon model | |||
| whole sample | 6933 | −11.1 ± 0.9 | 77.8 ± 0.7 |
| μ < 20 mas | 6555 | −11.0 ± 1.0 | 79.6 ± 0.7 |
| bright RC | 1408 | −10.0 ± 2.0 | 74.1 ± 1.4 |
| faint RC | 2802 | −11.1 ± 1.5 | 80.9 ± 1.1 |
| metal-rich third | 2311 | −13.1 ± 1.4 | 65.9 ± 1.0 |
| metal-poor third | 2312 | −9.2 ± 1.8 | 87.2 ± 1.3 |
Notes. The top group are the values measured from the observed sample, the bottom group are the values derived from ten simulation runs of the Besançon model (Robin et al. 2012).
Metal-rich and metal-poor population according to the Gaussian decomposition in Sect. 4.1.2.
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