TERZAN 5: the remnant of a pristine fragment of the Galactic Bulge?
Barbara Lanzoni (1), the Cosmic-Lab Team (1,2) ((1) Dipartimento di, Fisica e Astronomia -- Universita` di Bologna (2) Cosmic-Lab)

TL;DR
Terzan 5 is a complex stellar system in the Galactic bulge with multiple populations and metallicities, indicating it is a remnant of a primordial bulge fragment rather than a typical globular cluster.
Contribution
This study reveals the detailed chemical and population complexity of Terzan 5, suggesting it is a relic of the bulge formation process, unlike typical globular clusters.
Findings
Presence of two main stellar populations with distinct metallicities.
Detection of a third, more metal-poor population.
Chemical similarity with bulge stars indicating a possible bulge relic.
Abstract
Terzan 5 is a stellar system in the Galactic bulge commonly catalogued as a globular cluster. Through dedicated NIR photometry and spectroscopy we have discovered that it harbors two main stellar populations defining two distinct red clumps (RCs) in the colour-magnitude diagram, and displaying different iron content: [Fe/H] = -0.2 and [Fe/H]=+0.3 for the faint and the bright red clumps, respectively. In addition, a third minor population with significantly lower metallicity ([Fe/H]=-0.79) has been recently detected, thus enlarging the metallicity range covered by Terzan 5 to Delta[Fe/H] ~ 1 dex. This evidence demonstrates that, similarly to omega Centauri in the Galactic halo, Terzan 5 is not a genuine globular cluster, but a stellar system that experienced a much more complex star formation and chemical enrichment history. Moreover the striking chemical similarity with the bulge stars…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation
