The surface temperature of a red star is lower than the surface temperature of a yellow star.
Explanation:
For a red star, the peak of the wavelength of the emitted light is in the red spectrum, therefore the average peak wavelength is:
The corresponding temperature at the surface of the star can be found by using Wien's displacement law:
where
is a constant. Substituting, we find
For a yellow star, the peak of the wavelength of the emitted light is in the yellow spectrum, therefore the average peak wavelength is:
So we can use again the same equation to find the corresponding surface temperature of a yellow star:
Therefore, we see that the surface temperature of a red star is lower than the surface temperature of a yellow star.
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