VV Cep evolution at low resolution

[HughAllen]

Latest update on the progress of the VV Cep eclipse. It looks like the eclipse of the Balmer emission region is fully over. I'll follow the star for another month or two in order to complete the baseline this side of the eclipse. Thanks to all those who allowed me to include their low res spectra in the analysis: Jim Ferreira, James Foster, David Boyd and Steve Cuthbert
Cheers
Hugh

[Francois Teyssier]

Impressive work and results
Congratulations
François Teyssier

[HughAllen]

The British Astronomical Association has published in the August Journal my refereed paper on the spectroscopic evolution of the 2017 - 2019 eclipse of the red supergiant VV Cephei https://britastro.org/journal-full/26122
The BAA does a lot to encourage and support amateur spectroscopy, with mentor schemes, equipment loans and of course the BAA Spectroscopy Database. It's not possible to attach the paper here in pdf format so instead I'm attaching screenshots of each of the 7 pages of the paper if you'd like to read it. Apart from showing how much can be learnt from low resolution spectroscopy, the remarkable result from the study is the changing period in the orbit of the binary star which is quite difficult to explain!
Cheers
Hugh

[Ernst Pollmann]

Hi Hugh,
would you be so kind to send me a copy of the paper?
The reference 13 of that paper don`t mentioned the 43 day period of EW and line flux.
The discovery of this periodicity has been published only in the JAAVSO volume 48, 2020.

Ernst Pollmann

[HughAllen]

Hi Ernst,
I would be glad to send you a copy but I don't have yur email address. I have emailed you my address through the forum link
Cheers
Hugh

P.S. This is a screenshot of the abstract of your paper in reference 13

[Ernst Pollmann]

Hi Hugh,
sorry, you are right. The periodicity of 43 days of EW and line flux has been published in two paper, whereby its character have been described more in detail in the journal of AAVSO.
Here my email address:
ernst-pollmann(et)t-online.de

Ernst

[HughAllen]

Hi Ernst,
The email address is not recognised. Please send me a mail at allenhugh10@gmail.com and I will reply
Kind regards
Hugh

[Robin Leadbeater]

The periodicity of 43 days of EW and line flux has been published in two paper, whereby its character have been described more in detail in the journal of AAVSO.

Hi Ernst,

Hugh's paper was peer reviewed and accepted for publication before your AAVSO paper was published so had the most up to date reference available at the time

Cheers
Robin