Table 3
Family of Galactic bulge GCs with a metallicity of [Fe/H]∼−1.1, and very old age.
| Cluster | l | b | Age | Ref. | d⊙ | [Fe/H] | Ref. | E(B–V) | HB | MV | mass | orbit |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (deg) | (deg) | (Gyr) | (kpc) | (105M⊙) | ||||||||
| NGC 6256 | 347.79 | +3.31 | 12.9 ± 0.1 | 1 | 6.40 ± 0.64 | −1.05 ± 0.13 | 10 | 1.10 | blue | −7.15 | 0.72 ± 0.33 | B |
| HP 1 | 357.42 | +2.12 | 12.8 ±0.9 | 2 | 6.59 ± 0.65 | −1.01 ± 0.10 | 11, 12 | 1.19 | blue | −6.46 | 1.11 ± 0.38 | B |
| NGC 6401 | 3.45 | +3.98 | 13.2 ± 1.2 | 1 | 7.70 ± 0.77 | −1.00 ± 0.03 | 10, 12 | 0.53 | red | −7.90 | 1.21 ± 0.21 | B |
| Palomar 6 | 2.09 | + 1.78 | 12.4 ± 0.9 | 3 | 7.67 ± 0.19 | −1.10 ± 0.09 | 3 | 1.33 | red | −6.79 | 0.86 ± 0.19 | B |
| ESO456-SC38 (Djorg 2) | 2.76 | −2.50 | 12.7 ±0.7 | 4 | 8.75 ± 0.20 | −1.07 ± 0.09 | 13 | 0.89 | blue | −7.00 | 1.34 ± 0.24 | B |
| NGC 6522 | 1.02 | −3.93 | 12.8 ± 1.0 | 5 | 7.40 ± 0.19 | −1.05 ± 0.11 | 14, 15 | 0.48 | blue | −7.65 | 3.92 ± 0.54 | B |
| AL 3/BH 261 | 3.36 | −5.27 | 13.4 ± 1.2(*) | 6 | 6.50 ± 0.65 | −1.09 ± 0.05 | 6, 12 | 0.36 | blue | −4.19 | 0.24 ± 0.06 | B |
| NGC 6626 | 7.80 | −5.58 | 12.8 ± 1.0 | 5 | 5.34 ± 0.17 | −1.29 ± 0.01 | 16 | 0.42 | blue | −8.16 | 3.69 ± 0.38 | B |
| NGC 6642 | 9.81 | −6.44 | 12.7 ± 1.1 | 1 | 8.10 ± 0.81 | −1.11 ± 0.04 | 13 | 0.42 | intermediate | −6.66 | 0.87 ± 0.55 | B |
| NGC 6717 | 12.88 | −10.90 | 13.5 ±0.8 | 7 | 7.14 ± 0.10 | −1.26 ± 0.07 | 17 | 0.23 | blue | −5.66 | 0.26 ± 0.02 | B |
| Possible members | ||||||||||||
| Terzan 1 | 357.57 | + 1.00 | 12.6 ± 1.3(*) | 21 | 6.70 ± 0.7 | −1.06 ± 0.13 | 10 | 2.48 | red | −4.41 | 2.23 ± 0.66 | B |
| UKS 1 | 5.13 | −0.76 | 13.0 ± 1.2 | 8 | 11.10 ± 1.80 | −0.98 ± 0.11 | 18 | 2.62 | – | −6.91 | 0.80 ± 0.01 | – |
| NGC 6355 | 359.58 | +5.43 | 13.2 ± 1.0 | 0 | 8.54 ± 0.19 | −1.39 ± 0.08 | 0 | 0.89 | blue | −8.07 | 0.99 ± 0.03 | B |
| NGC 6540 | 3.29 | −3.31 | 12.6 ± 1.3(*) | 21 | 5.20 ± 0.52 | −1.06 ± 0.06 | 13 | 0.60 | – | −6.35 | 0.56 ± 0.04 | B |
| NGC 6638 | 7.90 | −7.15 | 12.0 ± 1.0 | 9 | 10.32 ± 1.03 | −0.99 ± 0.07 | 17 | 0.07 | intermediate | −7.12 | 1.24 ± 0.23 | TD |
| NGC 6723 | 0.07 | −17.23 | 12.6 ± 0.6 | 7 | 8.17 ± 0.11 | −1.01 ± 0.05 | 20 | 0.05 | intermediate | −7.83 | 1.57 ± 0.13 | TD |
Notes. B: Bulge; TD: Thick disc. References: Ages: 0 Souza et al. (2023, S23); 1 Cohen et al. (2021, C21); 2 Kerber et al. (2019, K19); 3 Souza et al. (2021, S21); 4 Ortolani et al. (2019, Or19); 5 Kerber et al. (2018, K18); 6 Barbuy et al. (2021b, B21b); 7 Oliveira et al. (2020, Ol20); 8 Fernández-Trincado et al. (2020, FT20); 9 Meissner & Weiss (2006, M06). Metallicity: 10 Vásquez et al. (2018, V18); 11 Barbuy et al. (2016, B16); 12 Geisler et al. (2023, Ge23); 13 Geisler et al. (2021, Ge21); 14 Barbuy et al. (2021a, B21a); 15 Fernández-Trincado et al. (2019, FT19); 16 Villanova et al. (2017, Vi17); 17 Carretta et al. (2009, C09); 18 Fernández-Trincado et al. (2020, FT20); 19 Ernandes et al. (2019, E19); 20 Fernández-Trincado et al. (2021, FT21); 21 Kharchenko et al. (2016, K16). Distances are from PV20 except for Pal 6 from S21. Absolute magnitudes are from Harris (1996). Masses are from Baumgardt & Hilker (2018)4.(*) indicates that the age was derived from the integrated magnitude and the errors are assumed as 10% of the age value.
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