An updated stellar census of the Quintuplet cluster
J. S. Clark, M. E. Lohr, L. R. Patrick, F. Najarro, H. Dong, D. F., Figer

TL;DR
This study refines the understanding of the Quintuplet cluster, revealing a more homogeneous stellar population and providing new insights into the evolutionary stages of its massive stars, with implications for stellar evolution models.
Contribution
It offers the first detailed observational analysis of the Quintuplet's stellar population, challenging previous notions of its diversity and aligning findings with evolutionary predictions for massive stars.
Findings
The cluster is more homogeneous than previously thought.
The stellar population includes a rich variety of supergiants and Wolf-Rayet stars.
The age of the cluster is estimated at 3.0-3.6 million years.
Abstract
The Quintuplet is one of the most massive galactic clusters known, but appears to host a diverse stellar population that is difficult to reconcile with an instantaneous formation event. We present HST photometry and VLT spectroscopy in order to improve observational constraints, finding the Quintuplet to be far more homogeneous than previously thought. O7-8 Ia and O9-B0 Ia supergiants form a smooth morphological sequence with a cohort of seven early-B hypergiants and six luminous blue variables and WN9-11h stars, which together comprise the richest population of such stars of any known stellar aggregate. No further H-free Wolf-Rayets were found, resulting in a 13:1 ratio for WC/WN stars. However a small population of late-O hypergiants and WN8-9ha stars was identified, while a subset of the supergiants are unexpectedly faint, suggesting they are both less massive and older than the…
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