it depends on the mass of the star.
It's luminosity and it's temperature.
The sun is a G-type main-sequence star (G V). It may be referred to as a yellow dwarf, or G dwarf star. Alternately it may be called a main-sequence star of spectral type G and luminosity class V.
How massive it is and its luminosity (the mass and luminosity correlate with each other with most stars, mainly the main sequence stars). The more mass a star has, the shorter its lifespan.
Main sequence stars are located on the H-R diagram based on their luminosity or absolute magnitude verses their spectral class and effective temperature.
Absolute magnitude = -0.5Colour would depend on it's temperature.
It's luminosity and it's temperature.
In that case, both the star's diameter and its luminosity greatly increase.
Algol is a blue main-sequence star in the constellation Perseus
Main sequence stars
The sun is a G-type main-sequence star (G V). It may be referred to as a yellow dwarf, or G dwarf star. Alternately it may be called a main-sequence star of spectral type G and luminosity class V.
How massive it is and its luminosity (the mass and luminosity correlate with each other with most stars, mainly the main sequence stars). The more mass a star has, the shorter its lifespan.
A star with luminosity class VI under the Yerkes Spectral Classification System. They have luminosity 1.5 to 2 magnitudes lower than main-sequence stars of the same spectral type.
Main sequence stars are located on the H-R diagram based on their luminosity or absolute magnitude verses their spectral class and effective temperature.
The main star in the Polaris system has a luminosity which is 2500 times that of the Sun.
It could be a main sequence star.
Absolute magnitude = -0.5Colour would depend on it's temperature.
See related link and you'll be able to work it out.