Breaking the dichotomy between typical and anomalous globular clusters: the case of NGC 3201. Issue Volume 14:Issue S351(2019) (May 2019)

• Record Type: Journal Article
• Authors: Dias, Bruno; Araya, Ignacio; Nogueira-Cavalcante, João Paulo; Saker, Leila; Shokry, Ahmed
• Editors: Bragaglia, Angela; Davies, Melvyn; Sills, Alison; Vesperini, Enrico
• Is Part Of: Proceedings of the International Astronomical Union. Volume 14:Issue S351(2019)
• Page Start: 293
• Page End: 296
• Publication Date: 2019-05
• Subjects: globular clusters: individual: NGC 3201, -- stars: abundances, -- Galaxy: halo, -- stars: population II, -- Astrophysics - Astrophysics of Galaxies; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921319006951
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: 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.