JWST observations of Terzan 5 reveal multiple stellar populations with ages of 12.5 and 4.7 Gyr, plus hints of a 3.8 Gyr component, suggesting a multi-epoch formation history.
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RR Lyrae stars yield metallicity measurements for Milky Way halo substructures including Gaia Sausage/Enceladus at [Fe/H] = -1.57 dex, with some features like ED-1 showing disk contamination and others like Shiva and Shakti suggested as in-situ.
ESO 456-SC38 is a 12.7 Gyr old, [Fe/H]=-1.11 globular cluster at 8.75 kpc in the inner Galactic bulge on the blue horizontal branch.
citing papers explorer
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The multi-age stellar populations of Terzan 5 as revealed by JWST
JWST observations of Terzan 5 reveal multiple stellar populations with ages of 12.5 and 4.7 Gyr, plus hints of a 3.8 Gyr component, suggesting a multi-epoch formation history.
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Probing the Milky Way Halo with RR Lyrae Stars from Gaia Data Release 3
RR Lyrae stars yield metallicity measurements for Milky Way halo substructures including Gaia Sausage/Enceladus at [Fe/H] = -1.57 dex, with some features like ED-1 showing disk contamination and others like Shiva and Shakti suggested as in-situ.
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Another relic bulge globular cluster: ESO 456-SC38 (Djorgovski~2)
ESO 456-SC38 is a 12.7 Gyr old, [Fe/H]=-1.11 globular cluster at 8.75 kpc in the inner Galactic bulge on the blue horizontal branch.