Affiliation: | Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy;Observatorio Nacional MCT, Rua General Jose Christino 77, 20912-400 Rio de Janeiro RJ, Brazil;Osservatorio Astronomico di Brera, Via Brera dell 28, I-20121 Milano, Italy;Observatoire Astronomique de Marseille, 2 Place Le Verrier, 13248 Marseille Cedex 04, France;Laboratoire d'Astrophysique Expérimentale, Universitéde Montréal, CP 6128 succ. centre ville, Montreal, Canada |