Table 2.
Spatial and kinematical properties of the samples, roughly ordered from younger to older (according to σu), from left to right, excluding the data from the Besançon Galactic model.
| Intrinsic | N-type | Extrinsic | Giant | Tc-poor | Tc-rich | 5.4–2.5 | 1.9–1.6 | 1.6–1.3 | 1.3–1.15 | 1.15–1 | M⊙ | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S | C | Sa | M | M | M | 0.15–1 | 2–3 | 3–5 | 5–7 | 7–10 | (Gyr) | |
| Abia | Famaey | This work | Besançon Galactic Model | |||||||||
| σu (km/s) | 27.4 | 27.7 | 33.1 | 31.8 ± 1.6 | 38.8 ± 0.5 | 46.3 ± 0.7 | 12.7 | 24.4 | 30.4 | 36.9 | 42.7 | |
| σv (km/s) | 18.2 | 19.0 | 24.8 | 17.6 ± 0.8 | 19.7 ± 0.2 | 29.4 ± 1.3 | 7.2 | 13.9 | 17.2 | 21.0 | 24.3 | |
| σw (km/s) | 15.2 | 12.6 | 16.3 | 16.3 ± 0.8 | 18.6 ± 0.4 | 12.3 ± 0.3 | 5.9 | 11.3 | 14.0 | 17.0 | 19.8 | |
| HZ (pc) | 150 | 200 | 260 | 196 | 190 | 190 | ||||||
| N | 50 | 144 | 85b | 3417 | 21 | 18 | ||||||
Notes. The quantities σu, σv and σw are the standard deviations of velocities in the heliocentric Galactic coordinate system; HZ is the Galactic scale height; and N is the number of stars in the sample. Predictions from the Besançon Galactic model are shown for comparison (as a function of age and main-sequence mass) for the thin disc (−0.1 ≤ [Fe/H] ≤ 0), from Robin (2021). The relation between solar-metallicity main-sequence lifetime τMS and mass M is derived from the simple relation τMS = 109 (M/M⊙)−2.5 Gyr. See text for more detailed estimates involving low-metallicity AGB stars. a No correction has been applied to use the binary’s centre-of-mass velocity, instead of the average velocity. b Excluding star CD –54°9245, which behaves like an outlier.
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