International observational campaign of the 2014 eclipse of EE Cep
Abstract
Context. EE Cep is one of few eclipsing binary systems with a dark, dusty disk around an invisible object similar to {\epsilon} Aur. The system is characterized by grey and asymmetric eclipses every 5.6 yr, with a significant variation in their photometric depth, ranging from ~ 0 m .5 to ~ 2 m .0. Aims. The main aim of the observational campaign of the EE Cep eclipse in 2014 was to test the model of disk precession (Galan et al. 2012). We expected that this eclipse would be one of the deepest with a depth of ~ 2 m .0. Methods. We collected multicolor observations from almost 30 instruments located in Europe and North America. This photometric data covers 243 nights during and around the eclipse. We also analyse the low- and high-resolution spectra from several instruments. Results. The eclipse was shallow with a depth of 0 m .71 in V-band. The multicolor photometry illustrates small color changes during the eclipse with a total amplitude of order ~ +0 m . 15 in B-I color index. The linear ephemeris for this system is updated by including new times of minima, measured from the three most recent eclipses at epochs E = 9, 10 and 11. New spectroscopic observations were acquired, covering orbital phases around the eclipse, which were not observed in the past and increased the data sample, filling some gaps and giving a better insight into the evolution of the H {\alpha} and NaI spectral line profiles during the primary eclipse. Conclusions. The eclipse of EE Cep in 2014 was shallower than expected 0 m .71 instead of ~ 2 m . 0. This means that our model of disk precession needs revision.
Keywords
Cite
@article{arxiv.2001.05891,
title = {International observational campaign of the 2014 eclipse of EE Cep},
author = {D. Pieńkowski and C. Gałan and T. Tomov and K. Gazeas and P. Wychudzki and M. Mikołajewski and D. Kubicki and B. Staels and S. Zoła and P. Pakońska and B. Dȩbski and T. Kundera and W. Ogłoza and M. Dróżdż and A. Baran and M. Winiarski and M. Siwak and D. Dimitrov and D. Kjurkchieva and D. Marchev and A. Armiński and I. Miller and Z. Kołaczkowski and D. Moździerski and E. Zahajkiewicz and P. Bruś and A. Pigulski and T. Smela and E. Conseil and D. Boyd and G. J. Conidis and I. Plauchu-Frayn and T. A. Heras and E. Kardasis and M. Biskupski and R. Kneip and L. Hambálek and T. Pribulla and E. Kundra and J. Nedoroščik and J. Lopatovský and Z. Garai and D. Rodriguez and T. Kamiński and F. Dubois and L. Logie and A. Capetillo Blanco and P. Kankiewicz and E. Świerczyński and M. Martignoni and I. Sergey and J. Kare Trandem Qvam and E. Semkov and S. Ibryamov and S. Peneva and J. -L. Gonzalez Carballo and J. Ribeiro and S. Dean and G. Apostolovska and Z. Donchev and L. Corp and P. McDonald and M. Rodriguez and A. Sanchez and K. Wiersema and E. Conseil and J. Menke and I. Sergey and N. Richardson},
journal= {arXiv preprint arXiv:2001.05891},
year = {2020}
}
Comments
10 pages, 13 figures, 29 tables in appendix, submited to Astronomy & Astrophysics