1 INTRODUCTION  
2 SAMPLE AND OBSERVATIONS  
2.1 HST Data  
2.2 Astrometry  
2.3 Ground-based Observations  
3 PHOTOMETRY  
4 DETERMINING THE PHYSICAL PARAMETERS  
4.1 Spectral Energy Distribution Fitting  
4.2 Luminosity Diagnostics  
5 RESULTS  
6 DISCUSSION  
7 SUMMARY