We review the multiple population (MP) phenomenon of globular clusters (GCs): ie, the
evidence that GCs typically host groups of stars with different elemental abundances and/or …

Recent progress in studies of globular clusters has shown that they are not simple stellar
populations, but rather are made up of multiple generations. Evidence stems both from …

We use high-precision photometry of red-giant-branch (RGB) stars in 57 Galactic globular
clusters (GCs), mostly from the 'Hubble Space Telescope (HST) UV Legacy Survey of …

Ages have been derived for 55 globular clusters (GCs) for which Hubble Space Telescope
Advanced Camera for Surveys photometry is publicly available. For most of them, the …

Star clusters are fundamental units of stellar feedback and unique tracers of their host
galactic properties. In this review, we will first focus on their constituents, ie detailed insight …

The globular cluster M15 is unique in its display of star-to-star variations in the neutron-
capture elements. Comprehensive abundance surveys have been previously conducted for …

We explain the multiple populations recently found in the 'prototype'globular cluster (GC)
NGC 2808 in the framework of the asymptotic giant branch (AGB) scenario. The chemistry of …

Star clusters form in dense, hierarchically collapsing gas clouds. Bulk kinetic energy is
transformed to turbulence with stars forming from cores fed by filaments. In the most compact …

We present a detailed chemical composition analysis of 35 red giant stars in the globular
cluster M 22. High resolution spectra for this study were obtained at five observatories, and …

We calculated synthetic spectra for typical chemical element mixtures (ie, a standard α-
enhanced distribution, and distributions displaying CN and ONa anticorrelations) found in …