[1] Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium
[2] Instytut Astronomiczny Uniwersytetu Wroclawskiego, Kopernika 11, 51-622 Wroclaw, Poland
[3] Department of Astrophysics, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, Netherlands
[4] Institut fur Astronomie, Universitat Wien, Turkenschanzstrasse 17, 1180 Wien, Austria
[5] Department of Astronomy, Beijing Normal University, Beijing 100875, China
[6] National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
[7] INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy
[8] Laboratoire AIM, Centre de Saclay, CEA/DSM-CNRS-Universite Paris Diderot, 91191 Gif-sur-Yvette, France
[9] Department of Physics, Astronomy and Materials Science, Missouri State University, 901 S. National, Springfield, MO 65897, United States
[10] Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom
[11] Department of Astronomy and Space Sciences, Ege University, 35100 Izmir, Turkey
[12] Izmir Institute of Technology, Department of Physics, 35430 Izmir, Turkey
[13] Observatoire de Geneve, Universite de Geneve, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
[14] Copernicus Astronomical Centre, Bartycka 18, 00-716 Warsaw, Poland
[15] Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens, Panepistimiopolis, 157 84 Zografos, Athens, Greece
[16] Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea, Republic of