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Table 4.
Observable constraints and optimal parameters derived for the α Cen system.
| Parameter | Obs. constraints | Standard | Entropy-calib. | ||
|---|---|---|---|---|---|
| YREC (SD19) | Cesam2k20 | YREC (SD19) | Cesam2k20 | ||
| α Cen A | |||||
| Mass (M⊙) | 1.1055 ± 0.004 (1) | – | – | – | – |
| Radius (R⊙) | 1.2234 ± 0.0053 (1) | 1.2235 | 1.2233 | 1.2097 | 1.2235 |
| Luminosity (L⊙) | 1.521 ± 0.015 (1) | 1.5091 | 1.5197 | 1.5045 | 1.5198 |
| (Z/X)s | 0.039 ± 0.006 (2,3) | 0.0315 | 0.0327 | 0.0347 | 0.0361 |
| Age (Gyrs) | – | 5.243 | 5.35 | 5.243 | 5.00 |
| αMLT | – | 1.71 | 1.732 | 1.758( * ) | 1.719( * ) |
| Y0 | – | 0.2785 | 0.2781 | 0.2785 | 0.2898 |
| Z0 | – | 0.027 | 0.0275 | 0.027 | 0.0298 |
| χ2 | – | 2.21 | 1.12 | 8.38 | 0.24 |
| α Cen B | |||||
| Mass (M⊙) | 0.9373 ± 0.003 (1) | – | – | – | – |
| Radius (R⊙) | 0.8632 ± 0.004 (1) | 0.8646 | 0.8631 | 0.8608 | 0.8687 |
| Luminosity (L⊙) | 0.503 ± 0.006 (1) | 0.5122 | 0.5032 | 0.5103 | 0.4994 |
| (Z/X)s | 0.039 ± 0.006 (2,3) | 0.0346 | 0.0357 | 0.0364 | 0.0339 |
| Age (Myrs) | – | 5.263 | 5.11 | 5.263 | 4.75 |
| αMLT | – | 2.04 | 1.985 | 2.05( * ) | 1.86( * ) |
| Y0 | – | 0.2668 | 0.2666 | 0.2668 | 0.2640 |
| Z0 | – | 0.0273 | 0.0278 | 0.0273 | 0.0263 |
| χ2 | – | 3.00 | 0.30 | 2.035 | 2.99 |
Notes. ( * )The values of αMLT are the final values of the model, as for ECM, αMLT is varying through evolution, as shown in Fig. 11, middle row.
References. (1): Kervella et al. (2017); (2): Thoul et al. (2003); (3): Porto de Mello et al. (2008).
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