Institution: | Kapteyn Astronomical Institute, Postbus 800, 9700 AV, Groningen, the Netherlands;Rochester Institute of Technology, 85 Lomb Memorial Drive, Rochester, New York 14623, USA;Sterrewacht Leiden, Niels Bohrweg 2, 2333 CA Leiden, the Netherlands;School of Physics &Astronomy, University of Nottingham, Nottingham NG7 2RD;Centre de Recherche Astronomique de Lyon, F-69561 Saint Genis Laval Cedex, France |