1 INTRODUCTION  
2 OBSERVATIONS  
2.1 HATSouth photometric detection  
2.2 Identification of stellar mass binaries by ANU 2.3 m/WiFeS  
2.3 High resolution spectroscopic follow-up  
2.4 Photometric follow-up  
3 ANALYSIS  
3.1 Fundamental stellar atmospheric parameters  
3.2 Global modelling of data  
3.3 Determination of mass and radius  
4 DISCUSSION