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Breaking the dichotomy between typical and anomalous globular clusters: the case of NGC 3201

Published online by Cambridge University Press:  11 March 2020

Bruno Dias Open the ORCID record for Bruno Dias [Opens in a new window] ,
Ignacio Araya ,
João Paulo Nogueira-Cavalcante ,
Leila Saker  and
Ahmed Shokry
Bruno Dias
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Vitacura19001, Chile Departamento de Fsica, Facultad de Ciencias Exactas, Universidad Andrés Bello, Av. Fernandez Concha 700, Las Condes, Santiago, Chile
Ignacio Araya
Affiliation:
Núcleo Matemáticas, Física y Estadística, Facultad de Estudios Interdisciplinarios, Universidad Mayor, Manuel Montt 318, Providencia, Santiago, Chile
João Paulo Nogueira-Cavalcante
Affiliation:
Observatório Nacional, Rua General José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil
Leila Saker
Affiliation:
Observatorio Astronómico de Córdoba, Laprida 854, 5000, Córdoba, Argentina
Ahmed Shokry
Affiliation:
National Research Institute of Astronomy and Geophysics (NRIAG), 11421, Helwan, Cairo, Egypt
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Abstract

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We recently discovered that NGC 3201 has characteristics that set it outside the current twofold classification scheme for Galactic globular clusters (GCs). Most GCs are mono-metallic and show light-element abundance variations (e.g., Na-O and C-N anti-correlations); but a minority of clusters also present variations in Fe correlating with s-process element and C+N+O abundances, and they possess multiple C-N sequences. These anomalous GCs also have a broad sub-giant branch (SGB) and follow the same mass-size relation as dwarf galaxies possibly evolving into GCs. We now revealed that NGC 3201 belongs to neither group. It has multiple C-N sequences, but no broad SGB, no strong evidence of a Fe-spread, and it does not follow the mass-size relation.

Keywords

globular clusters: individual: NGC 3201stars: abundancesGalaxy: halostars: population IIAstrophysics - Astrophysics of Galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 293 - 296
Copyright
© International Astronomical Union 2020

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