1 INTRODUCTION

2 PREVIOUS OBSERVATIONS
2.1 X-ray detection of B6-A7 stars
2.2 High-resolution imaging companion searches

3 SAMPLE

4 OBSERVATIONS

5 DATA ANALYSIS

6 RESULTS
6.1 Detections
6.2 Detection limits
6.3 Probability of chance superpositions

7 DISCUSSION
7.1 Multiplicity comparison
7.2 ROSAT positional uncertainty
7.3 Comparison of measured and expected X-ray luminosities

8 SUMMARY