Yes. A white dwarf is a compact star, the remnant of a star that has run our of fuel.
Stars like our Sun.
A Type Ia supernova is created by the merger of two white dwarfs. This type of supernova occurs when the combined mass of the white dwarfs exceeds a critical limit, leading to a thermonuclear explosion that destroys the star.
White dwarfs.
White dwarfs.
Many stars are white dwarfs.
No. Stars do not start as whit dwarfs. A white dwarf is the remnant of dead star.
The name "green dwarf" is not typically used in astronomy to describe a type of star. Stars are classified based on their spectral characteristics which determine their color. Common types include red dwarfs, white dwarfs, and brown dwarfs, but not green dwarfs.
red dwarfs
No, Rigel is not a white dwarf. Rigel is a blue supergiant star located in the constellation Orion. White dwarfs are the remnants of small to medium-sized stars that have exhausted their nuclear fuel and collapsed.
It is when the star is close to its death stage. {Main Sequence, Giant, Super Giant, and then the white dwarfs}
A dwarf star could form in different ways depending on what kind. Red dwarfs and brown dwarfs are formed when nebula compresses into a giant burning ball of gas, just like most stars do; white dwarfs are formed after a star became a red giant and blown off its outer layers, the remaining core became a white dwarf; black dwarfs are formed after white dwarfs cooled down and stopped emitting visible light.
Dying stars eventually shrink into white dwarfs (which as they age eventually become red dwarfs and then brown dwarfs - but this takes an extremely long time).