Table 3.
A summary of the 𝒢 functions for the Gaia benchmark stars, calculated using the colours (U − V), (B − V), and (V − J).
| Common | Probable | 90% Age | Offset from | Offset from | Probable | 90% [Fe/H] | Offset from |
|---|---|---|---|---|---|---|---|
| name | age (Gyr) | range (Gyr) | lit. (Gyr) | spec. (Gyr) | [Fe/H] (dex) | range (dex) | lit. (dex) |
| β Hyi | 5.4 | [3.5, 6.7] | −0.3 | −1.4 | +0.15 | [−0.11, +0.30] | +0.19 |
| HD 22879 | 8.2 | [3.2, 13.4] | −2.2 | −5.3 | −0.40 | [−0.64, −0.22] | +0.46 |
| τ Cet | 12.4 | [6.3, 12.6] | +6.2 | +3.1 | −0.35 | [−0.42, −0.23] | +0.14 |
| β Vir | 3.3 | [2.3, 5.0] | +0.4 | 0.0 | +0.20 | [+0.05, +0.44] | −0.04 |
| Arcturus | 2.9 | [1.5, 10.1] | −4.5 | −0.1 | −0.15 | [−0.32, +0.07] | +0.37 |
| μ Leo | 5.0 | [3.8, 5.9] | +1.6 | −0.3 | +0.50a | [+0.44, +0.50a] | +0.25 |
| β Gem | 1.5 | [0.9, 1.7] | +0.4 | +0.1 | +0.25 | [+0.15, +0.31] | +0.12 |
| ϵ Vir | 0.7 | [0.4, 0.8] | 0.0 | −0.9 | +0.00 | [−0.06, +0.11] | −0.15 |
| HD 107328 | 1.7 | [1.3, 3.5] | −4.9 | 0.0 | +0.05 | [−0.19, +0.21] | +0.38 |
| Gmb 1830 | 12.7 | [0.1, 13.4] | +3.2 | −0.8 | −1.20 | [−1.33, −1.01] | +0.26 |
| 61 Cyg B | – | – | – | – | – | – |
Notes.
For each star, we list the most probable age and [Fe/H] (highest point in the 𝒢 function), the offset of these values from the literature values, and also the maximum and minimum values for each parameter within the 90% confidence interval (“90% Age Range”, see Sect. 4.1). The 𝒢 function for 61 Cyg B produced no solution, see text for more details.
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