Globular clusters (GCs) exhibit star-to-star variations in specific elements (eg, He, C, N, O,
Na, Al) that bear the hallmark of high-temperature H-burning. These abundance variations …

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 …

We use accurate estimates of aluminium abundance from the APOGEE Data Release 17
and Gaia Early Data Release 3 astrometry to select a highly pure sample of stars with …

Context. In the last 15 years different ground-based spectroscopic surveys have been
started (and completed) with the general aim of delivering stellar parameters and elemental …

Context. The Gaia-ESO Public Spectroscopic Survey is an ambitious project designed to
obtain astrophysical parameters and elemental abundances for 100 000 stars, including …

Context. Recent James Webb Space Telescope (JWST) spectroscopic observations of the
z= 10.6 galaxy GN-z11 have revealed a very peculiar UV spectrum exhibiting intense …

We present a model for the concurrent formation of globular clusters (GCs) and
supermassive stars (SMSs,≳ 103 M⊙) to address the origin of the HeCNONaMgAl …

Globular clusters are large and dense agglomerate of stars. At variance with smaller clusters
of stars, they exhibit signs of some chemical evolution. At least for this reason, they are …

We investigate the Fe, C, N, O, Mg, Al, Si, K, Ca, Ce, and Nd abundances of 2283 red giant
stars in 31 globular clusters from high-resolution spectra observed in both the Northern and …

Nearly a decade ago, we began to see indications that reionization-era galaxies power hard
radiation fields rarely seen at lower redshift. Most striking were detections of nebular C iv …