Institution: | Department of Astronomy, University of Maryland, College Park, MD 20742, USA;Institut für Astronomie und Astrophysik, Abt. Astronomie, Universität Tübingen, Sand 1, 72076 Tübingen, Germany;Department of Physics, University of Warwick, Coventry CV4 7AL;Department of Physics and Astronomy, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, USA |