| Issue |
A&A
Volume 697, May 2025
|
|
|---|---|---|
| Article Number | A19 | |
| Number of page(s) | 9 | |
| Section | Galactic structure, stellar clusters and populations | |
| DOI | https://doi.org/10.1051/0004-6361/202452110 | |
| Published online | 30 April 2025 | |
The manifest link between Terzan 5 and the Galactic bulge
1
INAF, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna,
Via Gobetti 93/3,
40129
Bologna,
Italy
2
Dipartimento di Fisica e Astronomia, Università degli Studi di Bologna,
Via Gobetti 93/2,
40129
Bologna,
Italy
★ Corresponding author: livia.origlia@inaf.it
Received:
4
September
2024
Accepted:
21
March
2025
We address the chemical link between Terzan 5 (hereafter Ter5) and the Galactic bulge, as probed by the observed distributions of [α/Fe] abundance ratios with varying [Fe/H] and by suitable statistical tests to evaluate their significance. We also present a comprehensive review of the kinematic and evolutionary properties of Ter5, based on all the available observational signatures and the scenarios proposed so far in the literature for the formation and evolution of Ter5, as well as on the recent modelling of its star formation and chemical enrichment history. This analysis confirms the complex nature of this massive stellar system, with robust evidence of in situ bulge formation and of a subsequent evolution that cannot be simply explained by a single merging and/or accretion event of two globulars or a globular and a giant molecular cloud, as has been proposed in the literature, but it requires a more complex star formation likely accompanied by some self-enrichment.
Key words: techniques: spectroscopic / stars: abundances / stars: late-type / Galaxy: bulge / infrared: stars
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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