Why do some stars evolve into neutron stars and others into white dwarfs?

When a star ages, its thermonuclear reaction has exhausted the fuel (hydrogen) of the center, and there is not much energy produced by the center. In this way, it no longer has enough strength to carry the enormous weight of the shell. So under the weight of the shell, the core begins to collapse until it finally forms a small, dense star that regains its ability to balance with the pressure.

Stars with less mass mainly evolve into white dwarfs, while stars with more mass may form neutron stars. And according to the calculations of scientists, the total mass of a neutron star cannot be greater than three times the mass of the Sun. If this value is exceeded, there will be no force left to compete with its gravity, causing another collapse.

It is no more than 3 times the mass of the sun.

This is formed according to the mass of the star itself, some stars with small masses when their thermal energy is exhausted, the temperature will gradually cold cut, and the principle of heat expansion and cold contraction will begin to collapse and shrink to its core, so that it becomes a relatively small volume, but the density of the star may be a white dwarf, the mass of the star may become a neutron star after the same evolution, and there is a situation such as a star whose mass exceeds a certain limit value if it undergoes aging and may form a black hole in the process of collapse.

It seems that it can also become a black hole, which is said to be 2.5 million times the mass of the sun......Not very clear ......My book is very vague ......I guess there's no specific demarcation yet.

I'm just a very ordinary astronomy enthusiast, and I actually want to know the answer, but I didn't expect you to have ...... answer

In general, a star with less than 8 to 10 solar masses may eventually lose some or most of its mass and become a white dwarf.

Stars with more than 8 to 10 solar masses will eventually become neutron stars or black holes due to the gravitational collapse of their cores.

But because in the process of evolution, the star will eject a part of the matter, which will have an impact on the final outcome, so we can only say that the collapsed core mass is a multiple-to-times of the sun, and eventually becomes a neutron star.

Stars with collapsed cores that are more than Sun times the mass eventually become black holes.

Summary. Hello dear, happy to answer your <>

White dwarfs, neutron stars, and black holes are all end products of stellar evolution, and it is difficult for them to form new stars on their own. This is because:1

White dwarfs are extremely dense, but their masses are too small to meet the conditions for nuclear fusion. White dwarfs are stellar corpses dominated by electronic gases, nuclear fusion has stopped, and the internal pressure comes from the repulsion of electronic gases. This makes it difficult to accumulate enough hydrogen gas for nuclear fusion to form new stars.

2.Neutron stars have densities up to the nucleus density level and are made up of neutrons. This deprives it of the hydrogen and electrons necessary for star formation.

Neutron stars are unable to fuse with hydrogen, making it even more difficult to accretion enough gas to meet the conditions for new star formation. Neutron stars are the end of stellar evolution, and they no longer have the conditions and ability <>to form new stars

Can <> white dwarfs, neutron stars, black holes form new stars?

Hello dear, happy to answer your <>

White dwarfs, neutron stars, and black holes are all end products of the evolution of pure stars, and it is difficult for them to form new stars on their own. This is because:1

White dwarfs are extremely dense, but their masses are too small to meet the conditions for nuclear fusion. White dwarfs are stellar corpses dominated by electronic gases, nuclear fusion has stopped, and the internal pressure comes from the repulsion of electronic gases. This makes it difficult to accumulate enough hydrogen gas for nuclear fusion to form new stars.

2.Neutron stars have densities up to the nucleus density level and are made up of neutrons. This deprives it of the hydrogen and electrons necessary for star formation.

Neutron stars are unable to fuse with hydrogen, making it even more difficult to accretion enough gas to meet the conditions for new star formation. Neutron stars are the end of stellar evolution, and they no longer have the conditions and ability <>to form new stars

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<>3.The ultra-high density of a black hole makes it a balance in space"Black holes", no longer emits any electromagnetic radiation or matter. The material contained inside a black hole is locked by its strong gravitational field, preventing it from forming stars on the surface of the black hole or accreting it outside the black hole.

This deprives black holes of the necessary conditions and mechanisms for the formation of new stars. However, it is still possible for white dwarfs, neutron stars, and black holes to induce new star formation during the merger:1

The merger of binary white dwarfs can bury acres to form IA supernovae, release large amounts of hydrogen, and may induce the formation of new stars. 2.Neutron star conjunctions can be made to form a transient at the point of conjunction"Supernova", which produces supernovae** and blows away a large amount of gas, which may also induce nearby hydrogen to form new stars <>

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3.When a black hole merges into other stars or galaxies, it can disturb the surrounding gas through the gravitational attraction of the strong obscuration bend, and under certain conditions, it will touch the situation and cause the gas to collapse, inducing the formation of new stars. Therefore, although it is difficult for white dwarfs, neutron stars, and black holes to directly form new stars on their own, it is still possible to indirectly induce the collapse of surrounding gas and promote the formation of new stars under specific merger processes or gravitational disturbances.

This also shows that the mechanism of star formation in the universe is intricate, and it is worth further <>studying it

We know that the sun is almost 5 billion years old, and there are about 5 billion years to live. So,In 5 billion years, where will the sun go?

This involves the evolution of stars. When the hydrogen is exhausted, the sun will enter the end of the world, and helium will continue to fuse and evolve into red giants, and then continue to evolve, stars with masses less than times the mass of the Sun will become white dwarfs, stars with masses of multiple to multiple will become neutron stars, and larger stars will evolve into black holes.

The density of white dwarfs is relatively small, but far exceeds the density of Earth's material, reaching 10 million tons per cubic meter, which is 1 million times that of water, and a white dwarf material the size of a soybean can sink thousands of tons of freighters. Neutron stars are nearly 10,000 times denser than white dwarfs.

White dwarfs are darker than the sun, denser, and hotter. Due to the shrinking volume, the self-transformation is very fast, which also forms a strong magnetic field. Neutron stars rotate faster, have a stronger magnetic field, and rotate thousands of times per second, and some neutron stars emit pulsed signals during rotation, called pulsars.