HST photometry reveals radial color gradients in two ETGs that match predictions from the multiple-population scenario linking the UV upturn to second-generation stars from dissolved globular clusters.
Coeval multiple stellar populations in the young star cluster NGC 1978
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A Colour-colour Fingerprint Links the UV Upturn in Early-type Galaxies to Second-generation Stars from Dissolved Globular Clusters
HST photometry reveals radial color gradients in two ETGs that match predictions from the multiple-population scenario linking the UV upturn to second-generation stars from dissolved globular clusters.