G. Bono (1, 2), G. Iannicola (2), V.F. Braga (3, 4), I. Ferraro (2), P.B. Stetson (5), D. Magurno (1), N. Matsunaga (6), R.L. Beaton (7), R. Buonanno (8), B. Chaboyer (9), M. Dall'Ora (10), M. Fabrizio (2, 11), G. Fiorentino (12), W.L. Freedman (13,7), C.K. Gilligan (9), B.F. Madore (7), M. Marconi (10), M. Marengo (14), S. Marinoni (2, 11), P. Marrese (2, 11), C.E. Martinez-Vazquez (15), M. Mateo (16), M. Monelli (17, 18), J.R. Neeley (19), M. Nonino (20), C. Sneden (21), F. Thevenin (22), E. Valenti (23), A.R. Walker (15) ((1) Department of Physics, Università di Roma Tor Vergata, Roma, Italy, (2) INAF-Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy, (3) Instituto Milenio de Astrofisica, Santiago, Chile, (4) Departamento de Fisica, Facultad de Ciencias Exactas, Universidad Andres Bello, Santiago, Chile, (5) NRC-Herzberg, Dominion Astrophysical Observatory, Victoria BC, Canada, (6) Kiso Observatory, Institute of Astronomy, School of Science, The University of Tokyo, Nagano Japan, (7) The Observatories of the Carnegie Institution for Science, Pasadena, CA, USA, (8) INAF-Osservatorio Astronomico d'Abruzzo, Teramo, Italy, (9) Department of Physics, Astronomy, Dartmouth College, Hanover, NH, USA, (10) INAF-Osservatorio Astronomico di Capodimonte, Napoli, Italy, (11) SSDC, Roma, Italy, (12) INAF-Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Bologna, Italy, (13) Department of Astronomy, Astrophysics, University of Chicago, Chicago, IL, USA, (14) Department of Physics, Astronomy, Iowa State University, Ames, IA, USA, (15) Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, La Serena, Chile, (16) Department of Astronomy, University of Michigan, Ann Arbor, MI, USA, (17) Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain, (18) Departamento de Astrofisica, Universidad de La Laguna, Tenerife, Spain, (19) Department of Physics, Florida Atlantic University, Boca Raton, FL 33431, USA, (20) INAF-Osservatorio Astronomico di Trieste, Trieste, Italy, (21) Department of Astronomy, McDonald Observatory, The University of Texas, Austin, TX, USA, (22) Universite de Nice Sophia-antipolis, CNRS, Observatoire de la Cote d'Azur, Laboratoire Lagrange, Nice, France, (23) European Southern Observatory, Garching bei Munchen, Germany)
