Institution: | ;1Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA;2Depto. de Física –CFM –Universidade Federal de Santa Catarina, CP 476, Campus Universitário, Trindade, 88040-900, Florianópolis, SC, Brazil;3Depto. de Astronomia, Instituto Astronômico e Geofísico –USP, Av. Miguel Stefano 4200, 04301-904 São Paulo, Brazil;4Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA |