No, white dwarfs are cooler than supergiants, they also have a lower luminosity (are more faint).
A different viewpoint: There's obviously a range of temperatures for these stars, but the hottest (surface temperature) known star is in fact a white dwarf.
It has a surface temperature of over 200,000 degrees Celsius.
A star on the "main sequence" is a period in a stars stellar evolution, whereas a white dwarf is a stellar remnant.
A star on the "main sequence" is any star fusing hydrogen into helium, so size doesn't come into it.
In radius - a red giant will probably be bigger than a blue supergiant.
A red giant can be 10 to a 100 times larger than our Sun, whereas a blue supergiant is generally only about 25 times larger than our Sun.
A newly formed white dwarf has a much higher temperature that a red giant, however, because the white dwarf, has no means of maintaining that temperature, it will slowly cool until it is cooler than a red giant.
See related question.
A main sequence star is fusing hydrogen a white dwarf is not.
A main sequence star is a star a white dwarf is degenerate matter.
A main sequence star controls it's heat a white dwarf doesn't.
A main sequence star is a gaseous ball a white dwarf is a compact body of degenerate matter.
A main sequence star is fusing hydrogen, whereas a white dwarf is a degenerate star (A stellar remnant).
A main sequence star is huge, whereas a white dwarf is about the size of the Earth.
Yes a red giant is hotter than a white dwarf. A white dwarf has burned most or all of it's hydrogen and stays lit due to residual heat.
No, they start out cooler than the sun and will get progressively cooler over time.
Blue giant. Hotter stars are blue - white, cooler stars are red.
No. A white dwarf is much smaller than a main sequence star. Some are about the same size as Earth.
Black dwarfs have the lowest surface temperature.
White dwarfs have very small surface areas compared to main sequence stars and therefore cannot emit as much light.
Red Dwarfs.
The curve that contains most stars is called the "Main sequence". The stars on that curve are known as "main sequence stars". Their main characteristic is that they get their energy from fusing hydrogen-1 into helium-4.
From the Wikipedia article: "Most observed white dwarfs have relatively high surface temperatures, between 8,000 K and 40,000 K"
Black dwarfs have the lowest surface temperature.
White dwarfs have very small surface areas compared to main sequence stars and therefore cannot emit as much light.
Yes dwarf has higher temperature
no
Red Dwarfs
Red Dwarfs.
Red Giants - although they can be branch main sequence for a while.Brown DwarfsBlack dwarfsWhite dwarfsT-Tauri starsProtostarsNeutron starsPre-main sequence stars (PMS stars)
The curve that contains most stars is called the "Main sequence". The stars on that curve are known as "main sequence stars". Their main characteristic is that they get their energy from fusing hydrogen-1 into helium-4.
it's cool
Yes, all those types of stars have left the main sequence.
"Main sequence" stars are no longer new, and are just cookin' along for millions of years. "Main sequence" stars, depending on their weight and whether they orbit another nearby star can get old and become red dwarfs, white dwarfs, black dwarfs, neutron stars, novas, or super-novas.
From the Wikipedia article: "Most observed white dwarfs have relatively high surface temperatures, between 8,000 K and 40,000 K"