A&A 588, A55 (2016) Astronomy DOI: 10.1051/0004-6361/201527872 & c ESO 2016 Astrophysics Massive pulsating stars observed by BRITE-Constellation I. The triple system β Centauri (Agena) A. Pigulski1, H. Cugier1, A. Popowicz2,R.Kuschnig3,A.F.J.Moffat4,S.M.Rucinski5, A. Schwarzenberg-Czerny6 , W. W. Weiss3, G. Handler6,G.A.Wade7, O. Koudelka8,J.M.Matthews9, St. Mochnacki5, P. Orleanski´ 10,H.Pablo4, T. Ramiaramanantsoa4, G. Whittaker5,E.Zocłonska´ 6, and K. Zwintz11 1 Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622 Wrocław, Poland e-mail:
[email protected] 2 Instytut Automatyki, Politechnika Sl˛´ aska, Akademicka 16, 44-100 Gliwice, Poland 3 Institut für Astrophysik, Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria 4 Département de physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec, H3C 3J7, et Centre de recherche en astrophysique du Québec (CRAQ), Canada 5 Department of Astronomy & Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario, M5S 3H4, Canada 6 Centrum Astronomiczne im. M. Kopernika, Polska Akademia Nauk, Bartycka 18, 00-716 Warszawa, Poland 7 Department of Physics, Royal Military College of Canada, PO Box 17000, Station Forces, Kingston, Ontario, K7K 7B4, Canada 8 Institut für Kommunikationsnetze und Satellitenkommunikation, Technische Universität Graz, Inffeldgasse 12, 8010 Graz, Austria 9 Dept. of Physics & Astronomy, The University of British Columbia, 6224 Agricultural Road, Vancouver, B.C., V6T 1Z1, Canada 10 Centrum Badan´ Kosmicznych, Polska Akademia Nauk, Bartycka 18A, 00-716 Warszawa, Poland 11 Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstrasse 25/8, 6020 Innsbruck, Austria Received 1 December 2015 / Accepted 14 January 2016 ABSTRACT Context.