Why do most white dwarf stars have a lower luminosity than our sun?
how is it possible for white dwarf stars to have lower luminosity than the sun even though the sun is cooler than white dwarfs? white dwarf stars have lower luminosity then the sun because it is smaller and less dense.
Why do some nearby white dwarf stars have a relatively low luminosity even though they have relatively high temperatures?
Finally, there are also few stars found below the Main Sequence in the lower left (high temperature and low luminosity) corner. The stars of this group are known as White Dwarfs, and they have low luminosities because their radii are in general quite small, about the same as the Earth’s radius.
Why are white dwarfs dim even though they have a high temperature?
A white dwarf is very hot when it forms, but because it has no source of energy, it will gradually cool as it radiates its energy. This means that its radiation, which initially has a high color temperature, will lessen and redden with time.
How is it possible for white dwarf stars to have a lower luminosity than the sun even though the sun is cooler than white dwarfs?
White dwarf stars have a smaller size than the sun, also the sun is continuously generating energy while the dwarf stars can no longer generate any energy that is why the white dwarf planets have less luminosity than the sun.
Why is red giant more bright than a white dwarf?
It isn’t hot enough to start Carbon fusion. As a red giant still has active fusion reactions taking place, it is very luminous. A white dwarf on the other hand has no internal power source and slowly radiates away its heat, cooling and getting redder in the process.
What is the highest possible mass for a white dwarf?
1.4 solar masses
What is the coldest star color?
red
What type of stars live the longest?
The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.