Table 3.
Age determinations of NGC 6231 based on the Gaia membership.
| Model | Age (Myr) | AV (mag) | Population |
|---|---|---|---|
| PARSEC | 4.7 ± 0.4 | 1.7 ± 0.1 | All |
| MIST | 3.8 ± 0.4 | 1.5 ± 0.1 | All |
| PARSEC | 4.8 ± 0.2 | 1.7 ± 0.1 | MS |
| MIST | 4.4 ± 0.2 | 1.5 ± 0.1 | MS |
| PARSEC | 4.5 ± 0.7 | 3.0 ± 0.5 | PMS |
| MIST | 4.8 ± 1.4 | 2.9 ± 0.9 | PMS |
| Adopted | 4.7 ± 0.4 | 1.7 ± 0.1 | All |
Notes. The PARSEC and MIST models yield similar results on both the MS and whole population of NGC 6231. The fit to the PMS population failed to estimate the extinction and missed the MS population completely due to the lack of constraint in the MS section (see Fig. 11). The isochrone grid size is 0.1 Myr. In this work, we adopt the result of fitting to the PARSEC isochrone on the whole population as the age and extinction of the cluster.
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