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When a main sequence star has exhausted the fuel in the inner region it beomes a?
Wiki User
∙ 12y ago
The main sequence is red giant, white dwarf, brown dwarf, and black dwarf. When a main sequence has exhausted the hydrogen in its core the nuclear fusion stops. Then it becomes a helium burning white dwarf. When it cools then it becomes brown and then a black dwarf.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agoIn simplistic terms and probably homework answer is a Red Giant. [See related question]
However, the simplistic terms do not apply to stars:
Most stars are in the simplistic terms, they have a mass between 0.5 and 6 solar masses (A solar mass is the mass of our Sun).
Stars with a mass of lower than 0.5 solar masses will never become a red giant, they will just quite happily use up their hydrogen and then just fade away - they are called red dwarfs.[See related question]
Stars with a mass of greater than 6 solar masses will become red supergiants, or even hypergiants but will move back and forth from being a blue giant as the temperature increases due to addition fusion.
See related link for more information.
Wiki User
∙ 13y agoDepending on the mass of the star, they will become giants or black holes and pulsars. Whether they become one or the other depends on how massive the star is. We measure the mass against how many times the mass of our sun that star is.
Wiki User
∙ 11y agoindeed. stars on the main sequence burn hydrogen as their main fuel and the pressures are nice and balanced. once the star starts burning helium giving a quick helium flash and then it must expand to balance out the pressures. in turn, it cools off giving it a red color (blue is hottest, red is coolest). it continues fusing and burning progressively heavier elements until it reaches a critical instability. eventually, depending on the mass, it will either puff off its outer layers in a supernovae and remain as a white dwarf star (which will live for billions of years), or it will turn into a black hole (higher mass stars do this, i can't remember off the top of my head what the chandrasekhar limit is, but i think it's about 1.5 solar masses?)
Wiki User
∙ 11y agored giant
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What are the large cool stars that are not in the main sequence?
Large cool stars that are not in the main sequence are known as "red giants" or "red supergiants." These stars have exhausted the hydrogen fuel in their cores, causing their inner regions to contract while the outer layers expand. As a result, they become larger and cooler than when they were on the main sequence. Red giants are typically found in the later stages of stellar evolution, after they have exhausted their core hydrogen and started fusing helium in a shell around the core. They are often reddish in colordue to their lower surface temperature compared to main sequence stars. Red supergiants are even more massive and larger than red giants, representing the final stages of the life cycle of massive stars before they undergo supernova explosions or other dramatic events.
What is the force that keep a main sequence star from blowing apart?
The force of gravity. This is the only significant inner force in any star.
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