*Marcel M. Popescu¹、ERI TATSUMI²、Julia de León²、Javier Licandro²、David Morate²、Gabriel N. Simion³、Jin Beniyama⁴、Masatoshi Hirabayashi⁵ (1.Astronomical Institute of the Romanian Academy, 5 Cuţitul de Argint, 040557 Bucharest, Romania (mpopescu-ext@iac.es)、2.Instituto de Astrofísica de Canarias, C/ Vía Láctea, 38205 La Laguna, España、3.University of Amsterdam, Faculty of Science, 1090 GE Amsterdam, The Netherlands、4.Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan、5.Auburn University, Auburn, AL, USA)