Table 12.
Isochrone fitting age and metallicity ([Fe/H]) for the different independent substructures identified in this work.
| Substructure | Age | [Fe/H] |
|---|---|---|
| (Gyr) | (dex) | |
| Helmi (E) | 12.1 ± 1.1 | −1.45 ± 0.11 |
| 64 | 11.7 ± 1.4 | −1.47 ± 0.06 |
| Sequoia (# 63) | 12.2 ± 1.2 | −1.50 ± 0.09 |
| 62 | 12.3 ± 1.1 | −1.36 ± 0.13 |
| Thamnos 1 (B1) | 11.6 ± 1.4 | −1.42 ± 0.09 |
| Thamnos 2 (B2) | 12.3 ± 1.0 | −1.30 ± 0.14 |
| GE (C) | 11.4 ± 1.4 | −1.12 ± 0.10 |
| 6 | 11.3 ± 1.4 | −1.10 ± 0.07 |
| 3 | 10.5 ± 1.9 | −0.75 ± 0.11 |
| A | 8.9 ± 2.1 | −0.55 ± 0.10 |
| 12 | 10.4 ± 1.9 | −0.64 ± 0.10 |
| 38 | 10.7 ± 1.6 | −0.64 ± 0.11 |
Notes. If cluster #12 is split into two populations, i.e. the low- and the high-metallicity peaks seen in Fig. 12, our isochrone fits estimate a mean age of 12.2 ± 1 Gyr for the low-metallicity stars, and 8.8 ± 0.52 Gyr for those with high metallicity. The latter is consistent with that of substructure A.
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.