Institution: | Department of Physics, Keele University, Keele, Staffordshire ST5 5BG;Gemini Observatory, 670 N. A'ohōkūPlace, Hilo, HI 96720, USA;Department of Pure &Applied Physics, Queen's University of Belfast, Belfast BT7 1NN;Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE |