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The binary content of multiple populations in NGC 3201

Kamann, S, Giesers, B, Bastian, N, Brinchmann, J, Dreizler, S, Göttgens, F, Husser, T-O, Latour, M, Weilbacher, PM and Wisotzki, L (2020) The binary content of multiple populations in NGC 3201. Astronomy and Astrophysics, 635. ISSN 0004-6361

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Related URLs:
Date Deposited: 09 Apr 2020 11:06
Last Modified: 09 Apr 2020 11:15
DOI or Identification number: 10.1051/0004-6361/201936843
URI: http://researchonline.ljmu.ac.uk/id/eprint/12006

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