What is the general upper mass limit for an object to still be classified as a red dwarf?
Answer
About $0.6 M_{\odot}$
The upper limit for red dwarfs is generally considered to be masses up to about $0.6 M_{\odot}$, with more massive objects being classified as K-type or G-type stars.
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The Smallest Stars in the Universe - Red Dwarfs - YouTube
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