Acknowledgments

A.D. acknowledges the support of Research Excellence Scholarship from Macquarie University, and is grateful to Prof. Quentin A. Parker for supporting the ANU2.3-m observing run, and the staff at the Siding Spring Observatory for their support. The author also thanks the anonymous referee for constructive comments and suggestions.

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the Data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

Facilities: ATT (WiFeS), HST (WFPC2).