Multiple stellar populations in globular clusters
N Bastian, C Lardo�- Annual review of Astronomy and�…, 2018 - annualreviews.org
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
can be observed spectroscopically and also photometrically, with the appropriate choice of
filters, due to the changing of spectral features within the band pass. This phenomenon is
observed in nearly all of the ancient GCs, although, to date, it has not been found in any
massive cluster younger than 2 Gyr. Many scenarios have been suggested to explain this�…
Na, Al) that bear the hallmark of high-temperature H-burning. These abundance variations
can be observed spectroscopically and also photometrically, with the appropriate choice of
filters, due to the changing of spectral features within the band pass. This phenomenon is
observed in nearly all of the ancient GCs, although, to date, it has not been found in any
massive cluster younger than 2 Gyr. Many scenarios have been suggested to explain this�…