1. Departamento de Física, CCNE, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS, Brazil
2. Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
3. Departamento de Física, IF, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970, Porto Alegre, RS, Brazil
4. European Southern Observatory, Karl-Schwarzschildstr 2, D-85748 Garching bei München, Germany
5. Department of Astronomy, Nanjing University, Nanjing 210093, China
6. Observatório Nacional - MCT, Rua General José Cristino 77, Rio de Janeiro, RJ - 20921-400, Brazil
7. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
8. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St George Street, Toronto, Ontario M5S 3H4, Canada
9. Apache Point Observatory, PO Box 59, Sunspot, NM 88349, USA
10. Sternberg Astronomical Institute, Moscow State University, 119992 Moscow, Russia