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Table 5
Parameters and uncertainties estimated from a Levenberg-Marquardt fit of our model to the VLTI/AMBER φdiff observed on studied stars, and compared with values found in the literature.
| New studied stars | ||||||
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| Parameters | Altair | δ Aquilae | Fomalhaut | |||
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| Comparison of best fit values those from literature | ||||||
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| Best-fit parameter | In this paper | In the literature | In this paper | In the literature | In this paper | In the literature |
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| Equatorial radius Req | 2.0 ± 0.2 R⊙ | 2.029 ± 0.007 R⊙a | 2.2 ± 0.3 R⊙ | Rmean = 2.04 R⊙ b | 1.8 ± 0.2 R⊙ | Rmean = 1.8 R⊙ f |
| Equatorial rotation velocity Veq | 269 ± 14 km s-1 | 285.8 ± 12 km s-1a | 75 ± 23 km s-1 | Veqsini = 68.4 km s-1e to 89 km s-1c | 93 ± 7 km s-1 | 93 km s-1d |
| Rotation-axis inclination angle i | 57.3 ± 5.6° | 57.2 ± 1.9°a | 81 ± 13° | ?° | 90 ± 9° | ?° |
| Rotation-axis position angle PArot | −65.5 ± 5.5° | −61.8 ± 0.8°a | −101.2 ± 13.6° | ?° | 65.6 ± 4.7° | 65 ± 3°d |
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| χ 2 | 1.8775 | 1.3297 | 0.44132 | |||
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| Fixed parameter | Value | |||||
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| Distance d | 5.14 pca | 15.5 pcb | 7.66 pcf | |||
| Mass M | 1.791 M⊙a | 1.65 M⊙b | 2 M⊙f | |||
Surface mean effective temperature
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7700 Ka | 7119 Ke | 8760 Kf | |||
| Gravity-darkening coefficient β | 0.19a | 0.20 | 0.20 | |||
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| Derived parameter | Value | |||||
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| Equatorial angular diameter ⌀eq | 3.69 ± 0.36 mas | 1.27 ± 0.17 mas | 2.19 ± 0.24 mas | |||
| Equatorial-to-polar radii Req/Rp | 1.22 ± 0.12 | 1.02 ± 0.14 | 1.02 ± 0.11 | |||
| Veqsini | 226 ± 12 km s-1 | 74 ± 23 km s-1 | 93 ± 7 km s-1 | |||
| V eq / V crit | 0.74 ± 0.04 | 0.26 ± 0.08 | 0.25 ± 0.02 | |||
| Polar effective temperature Tpol | 8912 ± 234 K | 7233 ± 510 K | 8909 ± 342 K | |||
| Equatorial effective temperature Teq | 7372 ± 937 K | 7123 ± 1107 K | 8764 ± 1024 K | |||
| Luminosity log L/L⊙ | 1.025 ± 0.028 | 1.002 ± 0.037 | 1.192 ± 0.038 | |||
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