Table 1.
Literature reddening, ages, distances, and metallicities for NGC 6528 and NGC 6553.
| E(B-V) | Age | d⊙ | [Fe/H] | Method | Reference |
|---|---|---|---|---|---|
| Gyr | kpc | ||||
| NGC 6528 | |||||
| 0.52±0.07 | – | 6.1 | −0.4 | CMD | VDB79 |
| 0.56±0.03 | – | – | +0.01±0.10 | IPhot | Z80 |
| – | – | – | −0.18±0.36 | IPhot | B83 |
| — | – | – | +0.11±0.21 | spec | ZW84 |
| – | – | – | −0.23±0.11 | IS | A88 |
| 0.66±0.09 | – | – | −0.05±0.2 | IS | B86 |
| 0.55±0.1 | 14 | 7.5 | high | CMD | O92 |
| # – | 11±1.5 | – | +0.00 | CMD | O95 |
| # 0.52±0.05 | – | 7.83 | −0.1±0.1 | CMD | B98 |
| 0.8 | .– | – | +0.1 | CMD | R98 |
| 0.29 | .– | 0.7±1.1 | +0.0±0.09 | CMD | H99 |
| – | – | – | +0.07±0.02 | spec | C01 |
| — | 11±0.2 | 7.2 | +0.00 | CMD | F02 |
| 0.55 | 12.6 | 7.7 | +0.00 | CMD | Mo03 |
| 0.46 | – | – | −0.1±0.2 | spec | Z04 |
| 0.62 | – | – | −0.17±0.01 | spec | O05 |
| 0.54 | – | 7.9 | −0.1 3±0.05 | spec | D15 |
| 0.54 | 11±1 | 7.9 | +0.20 | CMD | L14 |
| – | – | – | +0.04±0.07 | spec | L17 |
| – | – | – | −0.19±0.04 | spec | S17 |
| – | – | – | −0.20±0.06 | spec | M18 |
| – | – | 7.83±0.23 | – | Gaia | B21 |
| NGC 6553 | |||||
| – | – | 4.8 | high | CMD | H75 |
| 0.78±0.03 | – | – | +0.04±0.10 | IPhot | Z80 |
| – | – | – | +0.47±0.63 | IPhot | B83 |
| – | – | – | −0.29±0.11 | spec | ZW84 |
| 0.79±0.09 | – | – | +0.10±0.4 | IS | B86 |
| 1.08 | 11.5±2.5 | – | high | CMD | O90 |
| 0.8 | – | – | −0.2±0.2 | spec | B92 |
| – | 11±1.5 | – | +0.00 | CMD | O95 |
| – | 8-13 | – | +0.00 | CMD | D92 |
| 0.7±0.05 | – | 5.25 | −0.22±0.05 | CMD/spec | G97,G98 |
| 0.7±0.06 | – | 5.1 | −0.2±0.1 | CMD | B98 |
| 0.48 | – | 6.2±0.7 | −0.04±0.08 | CMD | H99 |
| 0.7 | – | 5.1 | −0.55±0.2 | spec | B99 |
| 0.59±0.0 | – | 5.0 | −0.1±0.1 | CMD | S99 |
| – | – | – | −0.16±0.2 | spec | C99 |
| 0.63±0.03 | 13±1 | 5.3 | −0.10 | CMD | Z01 |
| 0.72 | 13 | – | −0.30 | CMD | B01 |
| – | – | – | −0.16±0.08 | spec | C99 |
| – | – | – | −0.3±0.2 | spec | O02 |
| 0.7 | – | 6.0 | −0.2±0.15 | spec | A06 |
| 0.63 | – | – | −0.13±0.02 | spec | D15 |
| – | – | – | −0.15±0.05 | spec | T17 |
| – | – | – | −0.11±0.04 | spec | S17 |
| – | – | – | −0.10±0.01 | spec | M21 |
| – | – | 5.33±0.13 | – | Gaia | B21 |
Notes. Alves-Brito et al. (2006, A06); Armandroff & Zinn (1988, A88); Bica & Pastoriza (1983, B83); Bica & Alloin (1986, B86); Barbuy et al. (1992, B92); Barbuy et al. (1999, B99); Baumgardt & Vasiliev (2021, B21); Beaulieu et al. (2001, B01); Cohen et al. (1999, C99); Carretta et al. (2001, C01); Demarque & Lee (1992, D92); Dias et al. (2015, D15); Feltzing & Johnson (2002, F02); Guarnieri et al. (1997, G97); Guarnieri et al. (1998, G98); Hartwick (1975, H75); Heitsch & Richtler (1999, H99); Lagioia et al. (2014, L14); Liu et al. (2017, L17); Meléndez et al. (2003, Me03); Momany et al. (2003, Mo03); Muñoz et al. (2018, M18); Montecinos et al. (2021, M21); Origlia et al. (2002, O02); Origlia et al. (2005, O05); Ortolani et al. (1990, O90); Ortolani et al. (1992, O92); Ortolani et al. (1995, O95); Richtler et al. (1998, R98) Sagar et al. (1999, S99); Schiavon et al. (2017, S17); Tang et al. (2017, T17); van den Bergh & Younger (1979, VDB79); Zinn (1980, Z80); Zinn & West (1984, ZW84); Zoccali et al. (2004, Z04). Methods for age, distance, and metallicity derivation: IPhot: integrated photometry; IS: integrated spectra; CMD: isochrone fitting on CMDs; Gaia proper motions, spec: spectroscopy.
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