Wolf-Rayet (6 of these)
Super-massive, super-hot, shedding atmosphere via light-driven stellar wind.
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Herschel's Ring is a nebula produced by the stellar wind from a super-hot Wolf-Rayet star ploughing into pre-existing medium.
Red: [SII] 10hrs, Green: H-alpha 5hrs, Blue: [OIII] 6hrs, all in 1hr 1x1 subs..
Field 36'arc, North up. Aspen CG16M on 20" PlaneWave.
As befits a WR rather than an SNR, there was very little SII in this image,
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