1. Observatoire astronomique de Strasbourg, CNRS, UMR 7550, F-67000 Strasbourg, France
2. Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
3. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
4. Instituto de Astrofisica de Canarias, Vía Láctea, E-38205 La Laguna, Spain
5. Departamento de Astrofísica, Universidad de La Laguna, Tenerife, E-38206 La Laguna, Spain
6. Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge, UK
7. Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada
8. GEPI, Observatoire de Paris, Université PSL, CNRS, Place Jules Janssen, F-92190 Meudon, France
9. Institute of Physics, Laboratoire d’astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire, CH-1290 Versoix, Switzerland
10. Department of Physics and Astronomy, University of Victoria, PO Box 3055, STN CSC, Victoria BC V8W 3P6, Canada
11. Kapteyn Astronomical Institute, University of Groningen, Landleven 12, NL-9747AD Groningen, the Netherlands