In this IAU Symposium on Wolf--Rayet stars, binary aspects received ample attention, notably because of the recognition that many observations of spectral and photometric variability at all accessible wavelengths are related to colliding winds or other forms of wind interaction.
The basic structure of the conference and its proceedings is basic parameters and general properties of WR stars; state of the art model atmospheres for WR stars, anisotropic mass loss and disk formation of WR stars, properties of WR binaries; influence of stellar winds on mass transfer in hot massive binary evolution; dust formation near WR stars and other circumstellar phenomena; and hydrodynamics and high-energy physics of colliding winds in WR+O binaries and of WR winds interacting with compact objects. Within this framework 20 invited reviews, 38 invited oral contributions, and 76 poster papers were presented at the Symposium, entertaining 111 astronomers from 24 countries. These proceedings provide up-to-date information on all aspects of Wolf--Rayet atmospheres, binaries, and colliding winds.

Zusammenfassung
Proceedings of the 163rd Symposium of the International Astronomical Union held in La Biodola, Elba, Italy, May 2--6, 1994

Inhalt
An Historical Introduction.- Session I. Basic parameters, properties of single Wolf-Rayet stars.- Session II Model atmospheres for single Wolf-Rayet stars.- Session III Anisotropic mass loss, disk formation.- Session IV Properties of Wolf-Rayet binaries.- Session V Stellar winds and massive binary evolution.- Session VI Dust formation near Wolf-Rayet stars and other circumstellar phenomena.- Session VII Hydrodynamics and high energy physics of colliding winds.- Session VIII Hydrodynamics and high-energy physics of winds accreting on neutrons stars and black holes.- Session IX Summary.- Author Index.- Object Index.