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snubnose:

--- Quote from: Is it cold in here? on 02 Mar 2021, 20:37 ---Theoretically possible but the universe hasn't been around long enough for one to form:

--- End quote ---
If I understand the (fixed) link correctly, blue dwarves like that arent actually blue, though.

They just have turned much of their hydrogen into helium, which causes a shrinking of the star (for helium is about four times more compact, or heavy, than hydrogen) and thus the gravitation and pressure increases, the temperature increases, and the process of fusion speeds up.

Thus they are just more "blue", i.e. hotter on the surface, than regular red dwarves, but not actually blue.

This is still inverse to what the sun will do. The sun, after its done with its hydrogen fuel, will collapse and heat up, until pressure and temperature increases so much that it will burn helium into carbon. This process is much less energetic, but happends much faster, which means the total energy output of the sun will increase and the outer shell (but not the core) will grow massively and thus cool down on the surface, turning the sun into a red giant. The sun will also form a second layer that will burn hydrogen from the outer shell into helium, too.

For being blue, a star needs to reach surface temperatures far beyond 10k K(elvin) (the surface temperature of what we consider a white star). The sun, a yellow star, only reaches around 5.7k K. Red dwarves have between 2k and 3.5k K, I cant find any information on how hot their surface temperature gets in the blue dwarf phase but I doubt it gets that much hotter than before.

According to this link, the maximum surface temperature a red dwarf will reach in the blue dwarf phase is about 9k K, which would make them just barely white.

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