1. Observatório Nacional, Rua General José Cristino 77, São Cristóvão RJ 20921-400, Rio de Janeiro, Brazil
2. European Organisation for Astronomical Research in the Southern Hemisphere, Karl Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
3. Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, SP 05508-900, Brazil
4. European Organisation for Astronomical Research in the Southern Hemisphere, Casilla, Santiago 19001, Chile
5. Faculty of Engineering, Hokkai-Gakunen University, Sapporo, Hokkaido 062-8605, Japan