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Jack, I have evaluated your 2015-09-10 spectrum. Please have a look at the Spectro-L Yahoo-List. I think also it would be at present more important to get a reliable base line, because we are in the “hot phase on the way” to the eclipse.
Ernst
News of VV Cep > see:
http://www.spectro-aras.com/forum/viewtopic.php?f=19&t=1713&p=8445#p8445
Ernst
A revision of the analysis of the previous campaign spectra has now led to the use of the equivalent width (EW) of the red and blue components for the determination of the baseline.
See: http://www.bav-astro.eu/index.php/veraenderliche/bedeckungsveraenderliche/vv-cep-kampagneTo translate the German text use the Google-translater.
In view of the immediate imminent eclipse, a well-defined base line now appears for both, the peak height and the EW. At the upcoming OHP spectroscopy session in the last week of July, we will try to improve the quality of the baselines by further observations.
Ernst Pollmann
Dear colleagues,
please don´t forget to observe VV Cep.
It is not exclude that the eclipse could begin some days before the calculated date August 4th.Ernst
Indeed, thanks for this alert Ernst,
Besides your message: “it is not exlude that the eclipse could begin some days before the calculated date August 4th”
it could also be later. According to the work of Leedjärv et.al. (A&A 1999) it seems the orbital period has a tendency of increasing between the eclipses due to a possible mass transfer or mass ejection. (Approximately 1% per two former eclipses).
http://adsabs.harvard.edu/full/1999A%26A…349..511L
Anyway we hope the weather conditions will be favourable at the very moment of the (calculated) beginning of the eclipse.
Usefull weather info with “observation location” input possibility:
http://www.meteoblue.com or http://www.meteovista.com/international/4220/0
Kind regards,
Marc.
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