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The binary content of multiple populations in NGC 3201
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The binary content of multiple populations in NGC 3201
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We investigate the binary content of the two stellar populations that coexist in the globular cluster NGC 3201. Previous studies of binary stars in globular clusters have reported higher binary fractions in their first populations (P1, having field-like abundances) compared to their second populations (P2, having anomalous abundances). This is interpreted as evidence for the latter forming more centrally concentrated. In contrast to previous studies, our analysis focuses on the cluster centre, where comparable binary fractions between the populations are predicted because of the short relaxation times. However, we find that even in the centre of NGC 3201, the observed binary fraction of P1 is higher, (23.1 +/- 6.2)% compared to (8.2 +/- 3.5)% in P2. Our results are difficult to reconcile with a scenario where the populations only differ in their initial concentrations, but instead suggests that the populations also formed with different fractions of binary stars.
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Cited by 1 Pith paper
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A universal chromosome map for globular clusters: chemical calibration and environmental regulation of the multiple populations
A new photometric index of globular-cluster chemical enrichment, corrected for metallicity, correlates most strongly with orbital confinement, suggesting an environmental imprint on multiple-population formation.
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