[1] Tata Inst Fundamental Res, Dept Astron & Astrophys, Mumbai 400005, Maharashtra, India
[2] Univ Turku, Finnish Ctr Astron ESO, Turku, Finland
[3] Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland
[4] Jagiellonian Univ, Astron Observ, Ul Orla 171, PL-30244 Krakow, Poland
[5] Pedag Univ, Mt Suhora Astron Observ, Ul Podchorazych 2, PL-30084 Krakow, Poland
[6] Czech Tech Univ, Fac Elect Engn, Tech 2, Prague 16627, Czech Republic
[7] Kazan Fed Univ, Engelhardt Astron Observ, Kremlyovskaya St 18, Kazan 420008, Russia
[8] Univ Helsinki, Dept Phys, Gustaf Hallstromin Katu 2a, FI-00560 Helsinki, Finland
[9] Space Sci Data Ctr Agenzia Spaziale Italiana, Via Politecn Snc, I-00133 Rome, Italy
[10] Inst Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[11] Osaka Kyoiku Univ, Astron Inst, 4-698 Asahigaoka, Kashiwara, Osaka 5828582, Japan
[12] European Space Agcy, Herschel Sci Ctr, ESAC, Villanueva Canada, E-28691 Madrid, Spain
[13] Liverpool John Moores Univ, Astrophys Res Inst, IC2, Liverpool Sci Pk,Brownlow Hill, Liverpool L3 5RF, Merseyside, England
[14] Phys Res Lab, Ahmadabad 380009, Gujarat, India
[15] Nord Opt Telescope, Apartado 474, E-38700 Santa Cruz De Palma, Spain
[16] Appalachian State Univ, Dept Phys & Astron, Dark Sky Observ, Boone, NC 28608 USA
[17] Canakkale Onsekiz Mart Univ, Fac Arts & Sci, Dept Phys, TR-17100 Canakkale, Turkey
[18] Canakkale Onsekiz Mart Univ, Astrophys Res Ctr, TR-17100 Canakkale, Turkey
[19] Canakkale Onsekiz Mart Univ, Ulupinar Observ, TR-17100 Canakkale, Turkey
[20] Taras Shevshenko Natl Univ Kyiv, Astron Observ 20, Observatorna Str 3, UA-04053 Kiev, Ukraine
[21] Valencian Int Univ, E-46002 Valencia, Spain
[22] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Metaxa & Vas Pavlou St, GR-15236 Athens, Greece
[23] BAA Variable Star Sect, 5 Silver Lane, West Challow OX12 9TX, Wantage, England
[24] C Jaume Balmes 24, E-08348 Barcelona, Spain
[25] C Riera 1 1 3, Barcelona, Spain
[26] Carretera Martos 28 Primero Fuensanta, Jaen, Spain
[27] North West Univ, Ctr Space Res, Private Bag X6001,North West Univ, ZA-2520 Potchefstroom, South Africa
[28] Inst Nacl Astrofis Opt & Electr, Apartado Postal 51-216, Puebla 72000, Mexico
[29] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[30] Jagiellonian Univ, Astron Observ, Ul Orla 171, PL-30244 Krakow, Poland
[31] Pedag Univ, Mt Suhora Observ, Ul Podchorazych 2, PL-30084 Krakow, Poland
[32] Ataturk Univ, Dept Astron & Astrophys, TR-25240 Erzurum, Turkey
[33] Aritz Bidea 8 4B, E-48100 Mungia Bizkaia, Spain
[34] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
[35] Univ Calif Berkeley, Miller Inst Basic Res Sci, Berkeley, CA 94720 USA
[36] Stockholm Univ, AlbaNova, Dept Astron, SE-10691 Stockholm, Sweden
[37] Stockholm Univ, AlbaNova, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
[38] Munas Arriba La Vara, Valdes MPC J38, E-33780 Valdes, Asturias, Spain
[39] Natl & Kapodistrian Univ Athens, Dept Astrophys Astron & Mech, GR-15784 Athens, Greece
[40] NASU, ICAMER Observ, 27 Acad Zabolotnoho Str, UA-03143 Kiev, Ukraine
[41] C Concejo Teverga 9,1C, E-28053 Madrid, Spain
[42] Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, India
[43] Univ North Carolina Chapel Hill, Chapel Hill, NC 27599 USA
[44] 16 Westminster Close, Basingstoke RG22 4PP, Hants, England
[45] Masaryk Univ, Dept Theoret Phys & Astrophys, Kotlarska 2, Brno 61137, Czech Republic
[46] Czech Acad Sci, Astron Inst, Ondrejov 25165, Czech Republic
[47] Czech Tech Univ, Fac Elect Engn, Prague, Czech Republic
[48] Tohoku Univ, Planetary Plasma & Atmospher Res Ctr, Sendai, Miyagi, Japan
[49] Isaac Newton Grp Telescopes, Apartado Correos 321, E-38700 Santa Cruz De La Palma, Spain
[50] Univ Alabama, Dept Phys & Astron, Box 870324, Tuscaloosa, AL 35487 USA