Affiliation: | Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85740 Garching bei München, Germany; Department of Physics, Carnegie-Mellon University, 5000 Forbes Ave., Pittsburgh, PA 15213, USA; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA |