Table 5
Best 1D relations.
| Formula | Adj-R2 | S.D. | Mean rel | a | b | Δa | Δb |
|---|---|---|---|---|---|---|---|
| Gyr | Gyr | Gyr dex−1 | Gyr | Gyr dex−1 | |||
| [Y/TiII] | 0.80 | 1.84 | 0.43 | 2.85 | −26.89 | 0.13 | 0.77 |
| [Y/Mg] | 0.79 | 1.85 | 0.57 | 3.32 | −23.93 | 0.13 | 0.71 |
| [TiII/Fe] | 0.79 | 1.89 | 0.53 | 3.37 | 33.87 | 0.13 | 1.01 |
| [Mg/Fe] | 0.79 | 1.91 | 0.61 | 3.84 | 29.85 | 0.12 | 0.89 |
| [Sr/Ti] | 0.78 | 2.05 | 0.41 | 3.04 | −26.94 | 0.13 | 0.83 |
| [Sr/TiII] | 0.77 | 2.13 | 0.63 | 3.34 | −24.58 | 0.13 | 0.78 |
| [Y/Ti] | 0.76 | 1.61 | 0.57 | 2.68 | −27.75 | 0.15 | 0.90 |
| [Sr/Mg] | 0.75 | 2.05 | 0.52 | 3.73 | −21.92 | 0.13 | 0.72 |
| [Ti/Fe] | 0.74 | 1.94 | 0.67 | 3.16 | 35.50 | 0.14 | 1.21 |
| [Si/Fe] | 0.68 | 2.28 | 0.56 | 3.17 | 45.66 | 0.16 | 1.79 |
| [Y/Zn] | 0.68 | 2.40 | 0.62 | 5.12 | −26.55 | 0.13 | 1.06 |
| [Zn/Fe] | 0.66 | 2.40 | 0.61 | 6.24 | 34.83 | 0.14 | 1.45 |
| [Y/Si] | 0.66 | 2.04 | 0.65 | 2.92 | −30.25 | 0.18 | 1.27 |
| [Sr/Si] | 0.65 | 2.36 | 0.60 | 3.34 | −28.48 | 0.17 | 1.19 |
Notes. “Formula” is the independent variable used for estimating the stellar age and adj-R2 is the statistic for measuring the goodness of the regression. We also detail the standard deviation (S.D.) of the age estimations using the regression compared with the “real” values for the test sample. Mean rel is the mean relative difference in % between estimations and “real” values. The rest are the linear regression coefficients and their uncertainties. See text for details.
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