Two Decades of Hypergiant Research

This article is a brief review of the research by Dr. C. de Jager and co-workers over the past twenty years into the physics of hypergiant atmospheres. Various important results on the microturbulence, mass-loss, circumstellar environment, atmospheric velocity fields, and the Yellow Evolutionary Void of these enigmatic stars are summarized. Aspects of recent developments and future work are also communicated.
11 pages, 1 picture. Review on cool hypergiants, in honour of the 80th birthday of Prof. C. de Jager