Sirius B

White dwarf

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Sirius B has a mass almost equal to sunlight Of quality And is one of the largest known white dwarfs. Sirius B turns into Sirius in a cycle of 50.1 years^[1] 。

Chinese name: Sirius B
Foreign name: Sirius B
Nature: White dwarf

Quality: About one time the mass of the sun
Distance from ground: 8.6 Light years
Diameter: About one time the diameter of the earth
Physical relationship: And Sirius A forms a binary star

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Sirius companion -- Sirius B (4 sheets)

The mass of Sirius B is almost equal to the mass of the sun, and it is the largest known mass White dwarf one of. It has almost twice the average solar mass of 0.5 to 0.6. However, so much material has been compressed to the size of the earth. Its current surface temperature is 25200 K. However, since there is no energy generated inside, the remaining heat will radiate out of outer space in the form of radiation, and Sirius B will eventually gradually cool down, taking more than 200 million years. A star will not become a white dwarf until it passes through the stages of main sequence star and red giant star. When Sirius B became a white dwarf, its age was a little less than half of its current age, about 120 million years ago. When it was a main sequence star, it was estimated to have 5 solar masses. It was a B-type star at that time. (About B4-5) When Sirius B was a red giant, it may have increased the metal content of its companion star Sirius A. Sirius B was originally composed of carbon and oxygen, which were produced by helium nuclear fusion in the dead star that formed Sirius B. These elements are covered by lighter elements and layered according to mass, because Sirius B has high surface gravity. Therefore, the outer atmosphere of Sirius B is almost pure hydrogen, universe The lightest element in the spectrum can not be found in any other elements.

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Herotu

White dwarf Compact star The core quality does not exceed Chandraseka limit (1.44 times the mass of the sun). Stars above this mass will eventually evolve into neutron stars or black holes. Its density is very large, compressing the solar mass objects in the space the size of the earth. White dwarfs are the final product of the evolution of low mass stars Herotu The center is located at the bottom left. After the nova explosion Planetary nebula middle. Later, the planetary nebula will spread, leaving only white dwarfs. When the white dwarf is completely cooled, it will become a black dwarf that does not radiate light, and will stay lonely in the universe.

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