Hi Alex
I took a series of images of Sigma1 Tau with my Canon 1100d with a 250mm FL lens between 23:43-00 and 23:45:00UT, 0.250sec exposures, at ISO 6400, I looked through all the images the stars light was constant, But then I suppose I was aiming for a lucky shot, there was a 4sec interval between my images so I would have probably missed it!
Peter Sheffield