Eta Orionis period with eShel spectrograph

[Ernst Pollmann]

James,
all Halpha spectra are still welcome, because we are working further on the topic, how the Vmag influences the level of Halpha EW.
That means we have to collect contemporaneous data of both.

Ernst

[Olivier GARDE]

Thank you James for the link.
I find also from the same author :
http://www.chara.gsu.edu/files/2007Meeting/OBrien.pdf