Affiliation: | Department of Physics and Astronomy, University College London, Gower St, London WC1E 6BT;Department of Astronomy, Peking University, Beijing 100871, China;Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, NY 10024, USA;Institut für Astronomie und Astrophysik, Abt. Astronomie, Sand 1, Universität Tübingen, 72076 Tübingen, Germany;Dr-Remeis-Sternwarte, Sternwartstraße 7, D-96049 Bamberg, Germany |