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Affiliation
American Association of Variable Star Observers (AAVSO)
Mon, 09/21/2020 - 09:30

Dear colleagues,
as complement to our publication in A&A 560, A30 (2013), we can notice today that a new V/R activity cycle has started. That means that the monitoring of the V/R ratio will be continued in order to confirm our found period of 84.2 day (+/- 2).

http://www.spectro-aras.com/forum/viewtopic.php?f=14&p=14760#p14760

Ernst Pollmann

Affiliation
American Association of Variable Star Observers (AAVSO)
pi Aqr

Dear colleagues,
our current monitoring of the Halpha V/R shows a periodic behavior (period = 42d), that does not fit to the periodicity we observed from 10/2004 to 01/2020 (period = 84.2d) (see link below).
The current period, the half of 84d, canĀ“t be explain at present, which is why observations are very urgent. It would be great, if interested obeserver could take at present spectra as much as possible.

/sites/default/files/u63093/current%20period.png
Ernst Pollmann