Institution: | Max-Plank-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching, Germany;Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Apdo Postal 70-264, Mexico DF 04510, Mexico;Center for Astrophysics, Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei, Anhui, China |