Table 5
The parameters of the best models found for Grid I (no diffusion) and II (He settling and diffusion), for each of the two methods.
| Grid I | Grid II | |||
|
|
||||
| Parameter | Method 1 | Method 2 | Method 1 | Method 2 |
|
|
||||
| M/M⊙ | 1.16 | 1.04 | 1.04 | 1.04 |
| R/R⊙ | 1.832 | 1.785 | 1.790 | 1.786 |
| L/L⊙ | 3.433 | 3.485 | 3.432 | 3.338 |
| Teff (K) | 5810 | 5908 | 5877 | 5843 |
| Age (Gyr) | 4.705 | 6.114 | 7.390 | 7.297 |
| Z | 0.0204 | 0.0124 | 0.0075 | 0.0075 |
| Y | 0.30 | 0.30 | 0.24 | 0.24 |
| [Fe/H] | 0.088 | –0.133 | –0.416 | –0.424 |
| α | 1.4 | 1.8 | 2.0 | 1.8 |
| r | 1.0000 | 0.9995 | 1.0000 | 1.0009 |
| a (μHz) | –4.80 | –3.14 | –2.43 | –3.11 |
| Δν0b (μHz) | 58.977 | 58.488 | 58.243 | 58.400 |
| Δν0a(μHz) | 57.678 | 57.652 | 57.600 | 57.577 |
| χ 2 | 19.086 | 1.183 | 26.226 | 2.642 |
Notes. The mass, M, luminosity, L, and radius, R, are expressed in solar units. Teff is the effective temperature, Y and Z are the initial helium and heavy-element abundances, [Fe/H] is the metallicity at the surface, and α is the mixing-length parameter. Also r and a are factors used to compute the correction term, Δν0b and Δν0a are, respectively, the large frequency separation before and after applying the surface correction to the model l = 0 modes. The values of χ2 are those calculated after correcting the frequencies for the near-surface effects.
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