Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/30451
Title: | Light element variations within the different age-metallicity populations in the nucleus of the Sagittarius dwarf | Authors: | Alison Sills Dalessandro, E. Mario Cadelano Mayte Alfaro-Cuello J. M. Diederik Kruijssen |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS | Number: | 490 | Issue: | 1 | First Page: | 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 |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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1910.00080.pdf | preprint | 834.83 kB | Adobe PDF | View/Open |
slz149.pdf | Pdf editoriale | 3.89 MB | Adobe PDF | View/Open |
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