Table 3
Comparison between observationally derived (Monnier et al. 2010) parameters of the star α Oph and our model.
| Observations | Model | |
|
|
||
| Mass (M⊙) |
|
2.22 |
| Req (R⊙) | 2.858 ± 0.015 | 2.865 |
| Rpol (R⊙) | 2.388 ± 0.013 | 2.385 |
| Teq (K) | 7570 ± 124 | 7674 |
| Tpol (K) | 9384 ± 154 | 9236 |
| L (L⊙) | 31.3 ± 1 | 31.1 |
| Veq (km s-1) | 240 ± 12 | 242 |
| Peq (days) | 0.598 | |
| Ppol (days) | 0.616 | |
| Xcore/Xenv | 0.37 | |
Notes.The mass fraction of hydrogen in the core is related to the age of the star. Peq and Ppol are the rotation periods in days at equator and pole as predicted by the model. A solar composition (X = 0.7, Z = 0.02) is assumed for the envelope.
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