EE Cep observing campaign 2020-2021

American Association of Variable Star Observers (AAVSO)
Mon, 02/24/2020 - 20:19

AAVSO Alert Notice 700 announces an observing campaign underway on the long period eclipsing binary EE Cep. Please see the notice for details and observing instructions.

Many thanks, and Good observing,

Elizabeth O. Waagen, AAVSO HQ

British Astronomical Association, Variable Star Section (BAA-VSS)
past EE Cep eclipse spectroscopy

High resolution:

It is not clear what the target SNR is but getting good SNR at R>10000 is likely to be tough at mag 10-12 with a typical amateur setup. The lines are strong though. This paper covering the last eclipse campaign has some examples of high resolution spectra.

Low resolution: 

The PI has requested flux calibrated spectra. This could be achieved by relative flux calibrating the spectra using a nearby reference combined with V band photometry as David Boyd did during the 2014 eclipse described here in the JBAA




Campaign 2020/21

Thank you very much for observing the eclipse of EE Cephei 2020. The observations will be used for publication and for my PhD thesis. All observers who took part in the campaign will be included in a publication.


However, I am asking you to continue monitoring the brightness of the EE Cephei star (once a week is enough). This will allow us to prepare for the phenomenon that will take place around ϕ = 0.2 of the orbital phase, 20th of May 2021 (JD 2459354). In the previous epochs at this point of the orbital period, an increase of the near-infrared Ic flux was observed (Pieńkowski et al. 2020).


I hope that our joint work will allow us to guess what is really happening in the EE Cep system.


At this point, data from all over the world are still being sent to me, and I will start standardizing them in about a month or two. Maybe I will contact some of you.

Best regards

Dariusz Kubicki