oMEGACat. VIII. A Subpopulation Census of {\omega} Centauri
C. Clontz, A. C. Seth, Z. Wang, M. Haeberle, M. S. Nitschai, N. Neumayer, P. J. Smith, M. Latour, A. Feldmeier-Krause, M. Libralato, A. Bellini

TL;DR
This study dissects the complex star populations of Omega Centauri, revealing age differences and formation histories that inform cluster assembly models using combined photometric and spectroscopic data.
Contribution
It provides a detailed subpopulation census of Omega Centauri, linking chemical and age properties to formation scenarios for the first time.
Findings
Chemically enhanced populations are ~1 Gyr younger with larger age spreads.
Primordial populations are older (~12.6 Gyr) with smaller age spreads.
The study connects the Chromosome Diagram to the age-metallicity relation.
Abstract
An understanding of the assembly history of the complex star cluster Omega Centauri has long been sought after, with many studies separating the stars on the color-magnitude diagram into multiple groupings across small magnitude ranges. Utilizing the oMEGACat combined astro-photometric and spectroscopic dataset we parse 14 subpopulations from the upper red-giant branch to below the main-sequence turnoff. We combine our results with previous works to estimate the age and age spread of each population. We find that the chemically enhanced (P2) populations are all ~1 Gyr younger (~11.6 Gyr old) and have significantly higher intrinsic age spreads (0.6 Gyr) than the primordial (P1) populations (~12.6 Gyr old, 0.3 Gyr spread), with the intermediate (Im) populations falling in between the two. Additionally, we connect for the first time the Chromosome Diagram to the two-stream age-metallicity…
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