Annu. Rev. Astron. Astrophys. 1994. 32: 227-275 Copyright © 1994 by Annual Reviews. All rights reserved

Reprinted with kind permission from Annual Reviews, 4139 El Camino Way, Palo Alto, California, USA

Key Words: Wolf-Rayet stars, starbursts, supergiants, initial mass function, CNO abundances

Table of Contents

INTRODUCTION

DISTRIBUTION OF INDIVIDUAL OB STARS

Overview

Direct Star Counts/Census

STELLAR MODELS AND OBSERVATIONS

Recent Progress in the Input Physics

Metallicity Effects in Massive Stars

Main Sequence Evolution

The Eddington Limit and LBV Stars

Blue and Red Supergiants

W-R STARS: OBSERVATIONS AND PREDICTIONS

Overview

Subtypes and Chemical Abundances

Physical Properties

Initial Masses, Lifetimes, Formation

W-R Statistics

MASSIVE STARS IN STARBURSTS

Integrated Spectra of Galaxies

Global Properties

CONCLUSIONS

REFERENCES

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