The mass of Vela X-1 the nature of Cygnus X-3 the character of Be stars

Thesis

Cover

Titlepage

Contents

Voorwoord en samenvatting

I The mass of Vela X-1

II The nature of Cygnus X-3

2 Infrared helium emission lines from Cygnus X-3 suggesting a Wolf-Rayet star companion

3 Spectroscopic and photometric variability of Cygnus X-3

4 The Wolf-Rayet counterpart of Cygnus X-3

III The character of Be stars

5 New bright Be stars and the Be star frequency

6 H emission and infrared excess in Be stars: probing the circumstellar disc

Cover