What is the approximate core temperature of a very low-mass star, like a red dwarf with $0.1$ times the mass of the Sun?

Answer

Around $5 ext{ MK}$ (5 million K)

For very low-mass stars, the core temperature is less intense; a red dwarf with $0.1$ solar mass maintains a core temperature of approximately $5$ million K while fusing hydrogen.

What is the approximate core temperature of a very low-mass star, like a red dwarf with $0.1$ times the mass of the Sun?
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