Answer :
A star's mass is constant. Compared to the Sun, it is hotter.
How can the temperature of stars be calculated?
Compare the ratio of red to blue light after measuring the brightness of a star with two filters. Create an exact color-temperature relation by comparing stellar spectra from different temperatures to those of computer model stellar spectra. The wavelength of light where a star's emission is concentrated is correlated with the star's temperature: the hotter the star, the more blue it is; the cooler the star, the more red it is. Stars produce colors in a wide range of wavelengths.
What does a star's temperature indicate?
The color of a star is determined by its surface temperature, which is measured in Kelvin. Red stars have the lowest temperatures, whereas blue stars have the highest. By comparing the spectra of stars to the spectrum of a black body, astronomers may determine the temperatures of the stars' surfaces.
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