Table 4
Literature ages and metallicities for NGC 6558.
| E(B–V) | Age | d⊙ | Method | [Fe/H] | Reference |
|---|---|---|---|---|---|
| (Gyr) | (kpc) | ||||
| 0.43 | – | 6.6 | 1 | −1.65 | H96 |
| 0.50 | – | 6.3 | 2 | −1.2/−1.6 | R98 |
| – | – | – | – | −1.5 | D04 |
| 0.38 | 14 | 6.4 | 2 | −0.97 | B07 |
| 0.44 | – | – | 2 | −1.21 | C10 |
| 0.44 | – | 7.4 | – | −1.32 | H10 |
| – | – | – | – | −1.03 | S12 |
| – | – | – | – | −1.012 | D15 |
| – | – | 7.4 | 3 | – | R15 |
| 0.38 | – | 8.26±0.53 | – | −1.17 | B18b |
| – | – |  |
4 | – | BV21 |
| – | – | – | – | −1.15 | GD23 |
Notes. Hazen (1996, H96); Rich et al. (1998, R98); Davidge et al. (2004, D04); Barbuy et al. (2007, B07); Chun et al. (2010, C10); Harris (1996, H10); Saviane et al. (2012, S12); Dias et al. (2015, D15); Rossi et al. (2015, R15); Barbuy et al. (2018b, B18b); Baumgardt & Vasiliev (2021, BV21); González-Díaz et al. (2023, GD23); Methods for age and distance derivation: 1 RR Lyrae; 2 isochrone fitting; 3 isochrone fitting on proper motion cleaned CMDs; 4 Gaia proper motions.
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