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Be stars are very specific objects to observe in spectroscopy, for several reasons. They are very active stars, which make them great laboratories for stellar physics models. They are not fully understood, despite the huge effort made by the community these last years. Be stars are quite common in the sky, and they are targets of choice for amateurs: they are bright, easy to observe all over the world, and a significant part of them is evolving fast, from hours to years.
From time to time, (...)