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Table 2.
Results of the Ai Phe binary system fitting in the four identified solution islands with variable surface [Fe/H].
| S1 | S2 | S3 | S4 | |
|---|---|---|---|---|
| Y |  |
0.261 ± 0.001 |  |
0.277 ± 0.003 |
| Z |  |
 |
 |
 |
| β |  |
 |
 |
0.265 ± 0.012 |
| Age (Gyr) |  |
 |
 |
 |
| Fit parameters | ||||
| Teff, 1 (K) | 5065 | 5034 | 5040 | 5213 |
| Teff, 2 (K) | 6227 | 6189 | 6249 | 6216 |
| R1 (R⊙) | 2.9307 | 2.9301 | 2.9301 | 2.9309 |
| R2 (R⊙) | 1.8033 | 1.8038 | 1.8038 | 1.8029 |
| [Fe/H]1 | −0.08 | −0.04 | −0.04 | −0.14 |
| [Fe/H]2 | −0.26 | −0.20 | −0.15 | −0.26 |
| χ2 | 3.4 | 2.8 | 3.2 | 7.3 |
Notes. In the first for raw we report: Y, initial helium abundance; Z, initial metallicity; β, convective core overshooting parameter; age in (Gyr) of the system.
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