@article {28378, title = {International observational campaign of the 2014 eclipse of EE Cephei}, volume = {639}, year = {2020}, month = {2020/07/1}, pages = {A23}, abstract = {Context. EE Cep is one of few eclipsing binary systems with a dark, dusty disc around an invisible object similar to ɛ Aur. The system is characterised by grey and asymmetric eclipses every 5.6 yr that have significant variations in their photometric depth, ranging from \~{}0.m5 to \~{}2.m0.
Aims: The main aim of the observational campaign of the EE Cep eclipse in 2014 was to test the model of disc precession. We expected that this eclipse would be one of the deepest with a depth of \~{}2.m0.
Methods: We collected multicoloured observations from almost 30 instruments located in Europe and North America. These photometric data cover 243 nights during and around the eclipse. We also analyzed low- and high-resolution spectra from several instruments.
Results: The eclipse was shallow with a depth of 0.m71 in the V band. The multicoloured photometry illustrates small colour changes during the eclipse with a total amplitude of order \~{}+0.m15 in the B - I colour index. We updated the linear ephemeris for this system by including new times of minima, measured from the three most recent eclipses at epochs E = 9, 10, and 11. We acquired new spectroscopic observations, covering orbital phases around the eclipse, which were not observed in the past and increased the data sample, filling some gaps and giving better insight into the evolution of the Hα and Na I spectral line profiles during the primary eclipse.
Conclusions: The eclipse of EE Cep in 2014 was shallower than expected, measuring 0.m71 instead of \~{}2.m0. This means that our model of disc precession needs revision.

Tables A1-A29 are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/639/A23}, keywords = {Astrophysics - Solar and Stellar Astrophysics, Be, binaries: eclipsing, circumstellar matter, stars: emission-line}, isbn = {0004-6361}, url = {https://ui.adsabs.harvard.edu/abs/2020A\&A...639A..23P}, author = {Pie{\'n}kowski, D. and Ga{\l}an, C. and Tomov, T. and Gazeas, K. and Wychudzki, P. and Miko{\l}ajewski, M. and Kubicki, D. and Staels, B. and Zo{\l}a, S. and Pako{\'n}ska, P. and Dȩbski, B. and Kundera, T. and Og{\l}oza, W. and Dr{\'o}{\.z}d{\.z}, M. and Baran, A. and Winiarski, M. and Siwak, M. and Dimitrov, D. and Kjurkchieva, D. and Marchev, D. and Armi{\'n}ski, A. and Miller, I. and Ko{\l}aczkowski, Z. and Mo{\'z}dzierski, D. and Zahajkiewicz, E. and Bru{\'s}, P. and Pigulski, A. and Smela, T. and Conseil, E. and Boyd, D. and Conidis, G. J. and Plauchu-Frayn, I. and Heras, T. A. and Kardasis, E. and Biskupski, M. and Kneip, R. and Hamb{\'a}lek, L. and Pribulla, T. and Kundra, E. and Garai, Z. and Rodriguez, D. and Kami{\'n}ski, T. and Dubois, F. and Logie, L. and Capetillo Blanco, A. and Kankiewicz, P. and {\'S}wierczy{\'n}ski, E. and Martignoni, M. and Sergey, I. and Kare Trandem Qvam, J. and Semkov, E. and Ibryamov, S. and Peneva, S. and Gonzalez Carballo, J. -L. and Ribeiro, J. and Dean, S. and Apostolovska, G. and Donchev, Z. and Corp, L. and McDonald, P. and Rodriguez, M. and Sanchez, A. and Wiersema, K. and Conseil, E. and Menke, J. and Sergey, I. and Richardson, N.} }