作者单位:1. Research School of Astronomy and Astrophysics, Australian National University, Cotter Rd., Weston, ACT 2611, Australia2. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA3. INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy4. INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy5. INAF-Osservatorio Astronomico di Roma, Via di Frascati, 33, 00040 Monteporzio Catone, Italy