Affiliation: | (1) Anglo-Australian Observatory, PO Box 296, Epping, NSW, 2121, Australia;(2) Astrophysics Group, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK;(3) Department of Physics, University College, ADFA, Canberra, 2600, Australia;(4) Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK |