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http://hdl.handle.net/20.500.12386/30451
Titolo: | Light element variations within the different age-metallicity populations in the nucleus of the Sagittarius dwarf | Autori: | Alison Sills Dalessandro, E. Mario Cadelano Mayte Alfaro-Cuello J. M. Diederik Kruijssen |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Numero: | 490 | Fascicolo: | 1 | Da pagina:: | L67 | Abstract: | The cluster M54 lies at the centre of the Sagittarius dwarf spheroidal galaxy, and therefore may be the closest example of a nuclear star cluster. Either in-situ star formation, inspiralling globular clusters, or a combination have been invoked to explain the wide variety of stellar sub-populations in nuclear star clusters. Globular clusters are known to exhibit light element variations, which can be identified using the photometric construct called a chromosome map. In this letter, we create chromosome maps for three distinct age-metallicity sub-populations in the vicinity of M54. We find that the old, metal-poor population shows the signature of light element variations, while the young and intermediate-age metal rich populations do not. We conclude that the nucleus of Sagittarius formed through a combination of in-situ star formation and globular cluster accretion. This letter demonstrates that properly constructed chromosome maps of iron-complex globular clusters can provide insight into the formation locations of the different stellar populations. | URI: | http://hdl.handle.net/20.500.12386/30451 | URL: | http://arxiv.org/abs/1910.00080v1 https://academic.oup.com/mnrasl/article-abstract/490/1/L67/5580282?redirectedFrom=fulltext |
ISSN: | 1745-3925 | DOI: | 10.1093/mnrasl/slz149 | Bibcode ADS: | 2019MNRAS.490L..67S | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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