The Complex Upper HR Diagram

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.

Introductory review chapter for e-book "Luminous stars in Nearby Galaxies" (https://www.mdpi.com/journal/galaxies/special_issues/Luminous)

References in corpus (16)

• The death of massive stars - I. Observational constraints on the progenitors of type II-P supernovae
• Observational constraints on the progenitors of core-collapse supernovae : the case for missing high mass stars
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
• Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud
• Spitzer SAGE-SMC Infrared Photometry of Massive Stars in the Small Magellanic Cloud
• Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient
• VLT spectroscopy of blue supergiants in IC 1613
• The Araucaria Project: the Local Group Galaxy WLM--Distance and metallicity from quantitative spectroscopy of blue Supergiants
• The Supernova Progenitor Mass Distributions of M31 and M33: Further Evidence for an Upper Mass Limit
• The M33 Variable Star Population Revealed by Spitzer
• Luminous and Variable Stars in M31 and M33. II. Luminous Blue Variables, Candidate LBVs, Fe II Emission Line Stars, and Other Supergiants
• Luminous and Variable Stars in M31 and M33. IV. Luminous Blue Variables, Candidate LBVs, and the B[e] Supergiants; How to Tell Them Apart
• A point source survey of M31 with the Spitzer Space Telescope
• Luminous and Variable Stars in M31 and M33 V. The Upper HR Diagram
• The Massive Star Population in M101. III. Spectra and Photometry of the Luminous and Variable Stars