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・ Blue Grass Army Depot
・ Blue Dragon Plus
・ Blue Dream
・ Blue Dream (cannabis)
・ Blue Dream Media
・ Blue Dress Park
・ Blue Drop
・ Blue Drop (disambiguation)
・ Blue duck
・ Blue Duck (disambiguation)
・ Blue Duck (outlaw)
・ Blue Duck River
・ Blue duiker
・ Blue Duster
・ Blue dwarf
Blue dwarf (red-dwarf stage)
・ Blue Dwarf roleplaying game
・ Blue Eagle
・ Blue Eagle (comics)
・ Blue Eagle (disambiguation)
・ Blue Eagle Gym
・ Blue Eagle, Minnesota
・ Blue Eagles
・ Blue Eagles FC
・ Blue Ear (comics)
・ Blue eared pheasant
・ Blue Earth
・ Blue Earth (album)
・ Blue Earth Area High School
・ Blue Earth City Township, Faribault County, Minnesota


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Blue dwarf (red-dwarf stage) : ウィキペディア英語版
Blue dwarf (red-dwarf stage)

A blue dwarf is a predicted class of star that develops from a red dwarf after it has exhausted much of its hydrogen fuel supply. Since red dwarfs fuse their hydrogen slowly and are fully convective (allowing their entire hydrogen supply to be fused, instead of merely that in the core), the Universe is currently not old enough for any blue dwarfs to have formed yet, but their future existence is predicted based on theoretical models.
Stars increase in luminosity as they age, and a more luminous star needs to radiate energy more quickly to maintain equilibrium. Stars larger than red dwarfs do this by increasing their size and becoming red giants with larger surface areas. Rather than expanding, however, red dwarfs with less than 0.25 solar masses are predicted to increase their radiative rate by increasing their surface temperatures and becoming "bluer". This is because the surface layers of red dwarfs do not become significantly more opaque with increasing temperature.〔
Blue dwarfs eventually evolve into white dwarfs once their hydrogen fuel is completely exhausted.〔 Eventually a white dwarf turns into a black dwarf.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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