1. Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
2. Institut für Physik und Astronomie, Universität Potsdam, Haus 28, Karl-Liebknecht-Str 24/25, D-14476 Golm (Potsdam), Germany
3. School of Mathematical and Physical Sciences, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia
4. Research Centre for Astronomy, Astrophysics and Astrophotonics, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia
5. Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, UK
6. European Southern Observatory, Karl-Schwarzschild-Str 2, D-85748 Garching bei München, Germany
7. INAF – Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy
8. Lennard-Jones Laboratories, Keele University, Keele ST5 5BG, UK