Free Access
Table 2
Parameters and uncertainties estimated from a Levenberg-Marquardt fit of our model to the VLTI/AMBER φdiff observed on Achernar.
| Best-fit parameter | Best-fit value and error |
|
|
|
| Equatorial radius Req | 11.6 ± 0.3 R⊙ |
| Equatorial rotation velocity Veq | 298 ± 9 km s-1 |
| Rotation-axis inclination angle i | 101.5 ± 5.2° |
| Rotation-axis position angle PArot | 34.9 ± 1.6° |
|
|
|
| Fixed parameter | Value |
|
|
|
| Distance d | 44.1 pc |
| Mass M | 6.1 M⊙ |
Surface mean temperature  |
15 000 K |
| Gravity-darkening coefficient β | 0.20 |
|
|
|
| Derived parameter | Value and error |
|
|
|
| Equatorial angular diameter ⌀eq | 2.45 ± 0.09 mas |
| Equatorial-to-polar radii Req/Rp | 1.45 ± 0.04 |
| Veqsini | 292 ± 10 km s-1 |
| Veq/Vcrit | 0.96 ± 0.03 |
| Polar temperature Tpol |  K |
| Equatorial temperature Teq |  K |
| Luminosity log L/L⊙ | 3.654 ± 0.028 |
Notes. The minimum reduced χ2 of the fit is 
. The Hipparcos distance d = 44.1 ± 1.1 pc from Perryman et al. (1997) was adopted to convert from linear to angular sizes.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.