| Affiliation: |
| AA( Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy ), AB( Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padova, Italy ), AC(Dipartimento di Astronomia dell'Universitàdi Padova, Vicolo Osservatorio 2, 35122 Padova, Italy ), AD(Copenhagen University Observatory. The Niels Bohr Institute for Astronomy, Physics and Geophysics Juliane Maries Vej 30, 2100 Copenhagen, Denmark ), AE(Instituto de Matemáticas y Física Fundamental, CSIC, C/ Serrano 113B, 28006 Madrid, Spain ) |