Thor's Helmet: Pre-Supernova with Emissions Nebula?”

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Thor's Helmet (NGC 2359) is currently in a pre-supernova stage, surrounded by an emissions nebula. This phenomenon occurs because giant stars shed their outer envelopes during the late stages of their evolution, even before going supernova. Eta Carinae serves as a relevant example of a similar pre-nova star exhibiting this behavior. The presence of the emissions nebula indicates ongoing processes related to the star's evolution. Understanding these stages is crucial for studying stellar life cycles and supernova events.
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I read that Thor's helmet (NGC 2359) is in a pre-supernova stage, but there is an emissions nebula around it. How this possible if the star is hasn't gone supernova?
 
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Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution.
 
mgb_phys said:
Don't know the specific object but giant stars lose their outer envelopes in the late stages of evolution.

Right. See Eta Carinae as an example of just such a pre-nova star.
 

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