Table 2.
Physical and geometrical parameters of Sargas measured from the MCMC fit of the β- and ω-models to the PIONIER (V2 and CP) and UVES (flux) data using the CHARRON and emcee codes (further details in the text of Sect. 4).
| Fitted parameters | β-model | ω-model |
|---|---|---|
| Equatorial radius: Req (R⊙) |
 |
 |
| Stellar mass: M (M⊙) |
 |
 |
| Equatorial rotation velocity: Veq (km s−1) |
 |
 |
| Inclination angle of rotation-axis: i (°) |
 |
 |
| Position angle of rotation-axisa: PArot (°) |  |
 |
Average effective temperature:  (K) |
 |
 |
| Gravity-darkening coefficient: β |
 |
− |
| Derived parameters | β-model | ω-model |
| Equatorial angular diameter: ⌀eq = 2Req/d (mas) | 3.09 | 3.09 |
| Polar radius: Rp (R⊙) | 25.81 | 25.92 |
| Polar angular diameter: ⌀p = 2Rp/d (mas) | 2.63 | 2.64 |
| Equatorial-to-polar radii ratio: Req/Rp | 1.1741 | 1.1689 |
| Flattening: ϵ = 1 − Rp/Req | 0.14825 | 0.14446 |
Radius of equivalent spherical star with same surface:  |
28.62 | 28.66 |
Angular diameter of equivalent spherical:  (mas) |
2.92 | 2.93 |
| Projected rotation velocity: Veqsini (km s−1) | 91.5 | 91.7 |
| Equatorial and polar Teff: Teq; Tp (K) | 5836; 6740 | 5841; 6770 |
| Equatorial and polar gravities: loggeq; loggp (dex) | 1.995; 2.320 | 2.003; 2.317 |
| Luminosity: L (L⊙); logL/L⊙ | 1091; 3.038 | 1100; 3.041 |
| Rotation period and frequency: Prot (day); Ω (rad/day) | 14.54; 0.432 | 14.74; 0.426 |
| Critical rotation rate (angular and linear): Ω/Ωc; Veq/Vc | 0.852; 0.667 | 0.845; 0.658 |
| Keplerian orbital rotation rate: Veq/Vk = Ω/Ωk | 0.590 | 0.581 |
| Equivalent gravity darkening coefficient: βω | − | 0.204 |
Notes. The best-fit values correspond to the median of histograms representing the probability distributions of the fitted parameter, while the uncertainties correspond to the commonly used 15.9 (−1σ) and 84.1 (+1σ) percentiles (cf. Figs. 4 and 5). We also give derived parameters with additional useful information on Sargas, obtained from the fitted parameters and from the equations in Sect. 3. Position angle of the sky-projected rotation-axis, counted from north to east until the visible stellar pole.
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