Nice one Rob. I've been meaning to get eta car for a while, didn't realise it would be quite so striking. Obvious similarities to a nova spectrum, and I guess we're looking at a very similar mechanism.
Eta car is a binary system with very high eccentricity, and it reaches periastron next year. I'm hoping to take part in the pro-am campaign for that event, should be interesting.
Have you tried gamma velorum?
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