When hydrogen in the core of the star is depleted, a balance no longer exists between pressure and gravity. Core contracts, temperatures incrase. This causes outer layers to expand and cool. This star is called a GIANT.
A star that is a white dwarf has exhausted its supply of hydrogen.
A star that has exhausted the hydrogen in its core will become a red giant or supergiant.
A star that has exhausted its hydrogen supply is called a red giant or a red supergiant, depending on its initial mass. This stage occurs when the star begins to fuse heavier elements in its core, leading to its expansion and eventual evolution into a white dwarf, neutron star, or black hole.
A star that has used up it's hydrogen supply because a "Red Giant". The star increases in diameter as it turns into a red giant.
Stars are powered by fusing hydrogen, not oxygen. A star that has exhausted the hydrogen in its core may continue to burn as a red giant.
A star that has exhausted its supply of hydrogen will evolve into a red giant or supergiant, depending on its initial mass. Eventually, it may undergo a helium flash and fusion of heavier elements before collapsing into a white dwarf or supernova.
Rigel has exhausted its supply of hydrogen and so is now composed mainly of helium, with minute quantities of heavier elements.
These are stars that have exhausted their core's supply of hydrogen by switching to a thermonuclear fusion made of hydrogen in a shell that surrounds the core.
A blue dwarf is a hypothetical type of star that develops from a red dwarf after it has exhausted much of its hydrogen fuel supply. Since red dwarf stars fuse hydrogen slowly and are fully convective (allowing a larger percentage of their total hydrogen supply to be fused), the current age of the universe is not old enough for any blue dwarfs to have formed yet.
A star evolves off the main sequence when it runs out of hydrogen fuel in its core. This causes the core to contract and heat up, leading to the expansion of the star's outer layers. This marks the beginning of the star's evolution into a red giant or supergiant, depending on its mass.
A fusion reactor stops in the main sequence stage when it runs out of hydrogen fuel at its core. As hydrogen is depleted, the fusion rate decreases, resulting in a decrease in energy production. At this point, the star will begin to expand and evolve into a different stage of its lifecycle.
A star's hydrogen supply runs out because of nuclear fusion in its core. As hydrogen is fused into heavier elements like helium, the star's core temperature increases, causing it to expand and cool. Eventually, the core runs out of hydrogen to fuse, leading to the star's evolution into a different phase.