The recent discovery of multiple stellar populations in massive Galactic globular clusters poses a serious challenge for models of star cluster formation and evolution. An unique angle on this problem is being provided by intermediate-age clusters in the Magellanic Clouds with peculiar main-sequence turn-off morphologies. These clusters are young

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Toda teoría que pretenda explicar la formación de las galaxias y su evolución posterior debe dar cuenta de la influencia del entorno sobre sus propiedades observacionales. Los cúmulos de galaxias, dadas las peculiares características que presentan --una alta densidad de materia bariónica en forma de galaxias y un medio intracumular caliente

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Using the near-infrared spectral stellar library of Cenarro et al., the behaviour of the MgI line at 8807 Å and nearby TiO bands is analyzed in terms of the effective temperature, surface gravity and metallicity of the library stars. New spectroscopic indices for both spectral features - namely MgI and sTiO - are defined, and their sensitivities to