Institution: | Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada;Astrophysikalisches Institut Potsdam, An der Sternwarte 16, Potsdam 14482, Germany;Steward Observatory, University of Arizona, Tucson, AZ 85721, USA;Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 487-3, Santiago, Chile |