TL;DR
This review discusses the complex structure of the upper HR Diagram for massive stars, shaped by mass loss, and summarizes key observational discoveries and the evolutionary stages of various evolved massive stars.
Contribution
It provides a comprehensive overview of the historical development and current understanding of the upper HR Diagram for massive stars, highlighting the diversity of evolved star types.
Findings
Mass loss significantly influences the upper HR Diagram structure.
Different evolved massive stars occupy distinct regions in the HR Diagram.
Observations in nearby galaxies have advanced understanding of massive star evolution.
Abstract
Several decades of observations of the most massive and most luminous stars have revealed a complex upper HR Diagram, shaped by mass loss, and inhabited by a variety of evolved stars exhibiting the consequences of their mass loss histories. This review presents a brief historical overview of the HR Diagram for massive stars, highlighting some of the primary discoveries and results from their observation in nearby galaxies. The chapters in this volume include reviews of our current understanding of different groups of evolved massive stars, all losing mass and in different stages of their evolution; the Luminous Blue Variables (LBVs), B[e] supergiants, the warm hypergiants, Wolf-Rayet stars, and the population of OB stars and supergiants in the Magellanic Clouds.
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