[1] Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508090 Sao Paulo, SP, Brazil
[2] Johns Hopkins Univ, Dept Phys & Astron, Bloomberg Ctr Phys & Astron, Room 520,3400 N Charles St, Baltimore, MD 21218 USA
[3] Katholieke Univ Leuven, Inst Astrophys, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
[4] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
[5] Royal Observ, UK Astron Technol Ctr, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
[6] Univ La Serena, Dept Fis & Astron, Av Cisternas 1200 Norte, La Serena, Chile
[7] Natl Observ Athens, IAASARS, Penteli 15326, Greece
[8] Univ Sheffield, Dept Phys & Astron, Housnsfield Rd, Sheffield S3 7RH, S Yorkshire, England
[9] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1090 GE Amsterdam, Netherlands
[10] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England
[11] Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands
[12] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany
[13] European Space Astron Ctr ESA ESAC, POB 78, Madrid 28691, Spain
[14] CSIC INTA, Ctr Astrobiol, Campus ESAC,Camino Bajo Castillo S-N, Madrid 28692, Spain
[15] Univ Montreal, Dept Phys, CP 6128,Succ C-V, Montreal, PQ H3C 3J7, Canada
[16] Ctr Rech Astrophys Quebec, CP 6128,Succ C-V, Montreal, PQ H3C 3J7, Canada
[17] Univ Toledo, Dept Phys & Astron, Ritter Observ, 2801 W Bancroft St, Toledo, OH 43606 USA
[18] Univ Potsdam, Inst Phys & Astron, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany
[19] Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland
[20] Armagh Observ, Coll Hill, Armagh BT61 9DG, North Ireland