1 INTRODUCTION

2 PHOTOMETRIC FOLLOW-UP OBSERVATIONS

3 SPECTROSCOPIC FOLLOW-UP OBSERVATIONS

4 THE POPULATION OF VARIABLES

5 SEARCHING FOR ULTRA COMPACT BINARIES

6 THE ECLIPSING SYSTEM OW J080311.83–291144.6

7 δ SCT-TYPE PULSATORS

8 THE SYMBIOTIC BINARIES SS73 122 AND HEN 2–357

9 SUMMARY AND CONCLUSIONS