Light element variations within the different age-metallicity populations in the nucleus of the Sagittarius dwarf
Date Issued
2019
Author(s)
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.
Volume
490
Issue
1
Start page
L67
Issn Identifier
1745-3925
Ads BibCode
2019MNRAS.490L..67S
Rights
open.access
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