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Our group's focus is the study of massive stars, both individually and in resolved and unresolved populations. These objects populate the upper part of the Hertzsprung-Russell diagram. On the main-sequence these stars are spectroscopically identified as types O and early B, while later evolutionary stages encompass supergiants and Wolf-Rayet stars. Our group also studies some stars of lower mass, which may show many features similar or related to those present in massive stars, and thus may improve our understanding of the physical processes occurring in massive stars.

Schematic of the 3-dimensional interior structure of a rotating massive star.

Credit: Georges Meynet

Multicolor image of M31's southwest region with the spectacular massive-star formation site NGC 206.


Credit: Phil Massey

2005 IAU Working Group on Massive Stars. All rights reserved. Last modified: May 27, 2010. This website is maintained by Raphael Hirschi (University of Keele, UK). Send e-mail with your questions and comments regarding the site: