A&A 574, A54 (2015) Astronomy DOI: 10.1051/0004-6361/201425260 & c ESO 2015 Astrophysics The two-colour EMCCD instrument for the Danish 1.54 m telescope and SONG? J. Skottfelt1;2, D. M. Bramich3, M. Hundertmark1, U. G. Jørgensen1;2, N. Michaelsen1, P. Kjærgaard1, J. Southworth4, A. N. Sørensen1, M. F. Andersen5, M. I. Andersen1, J. Christensen-Dalsgaard5, S. Frandsen5, F. Grundahl5, K. B. W. Harpsøe1;2, H. Kjeldsen5, and P. L. Pallé6;7 1 Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 København Ø, Denmark e-mail:
[email protected] 2 Centre for Star and Planet Formation, Natural History Museum, University of Copenhagen, Østervoldgade 5–7, 1350 København K, Denmark 3 Qatar Environment and Energy Research Institute, Qatar Foundation, PO Box 5825, Doha, Qatar 4 Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK 5 Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark 6 Instituto de Astrofísica de Canarias (IAC), 38200 La Laguna, Tenerife, Spain 7 Dept. Astrofísica, Universidad de La Laguna (ULL), 38206 Tenerife, Spain Received 1 November 2014 / Accepted 27 November 2014 ABSTRACT We report on the implemented design of a two-colour instrument based on electron-multiplying CCD (EMCCD) detectors. This instrument is currently installed at the Danish 1.54 m telescope at ESO’s La Silla Observatory in Chile, and will be available at the SONG (Stellar Observations Network Group) 1m telescope node at Tenerife and at other SONG nodes as well. We present the software system for controlling the two-colour instrument and calibrating the high frame-rate imaging data delivered by the EMCCD cameras.