Wolf-Rayet (6 of these)
Super-massive, super-hot, shedding atmosphere via light-driven stellar wind.
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Thor's Helmet, NGC 2359 in Canis Major. R: NII, G: H-alpha; B: OIII.. Each 6hrs x 1hr subs. Blue OIII is excited by the hardest UV from the central Wolf-Rayet star. Red NII shows more tenuous material recycled from stellar depths.. Aspen 16M on 20" PlaneWave.
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