This assertion is false: the total amount of light in the spectrum gives us the radius of the star.
The spectrum of a star and Wien's displacement law can be used to calculate the effective temperature of that star.
Because stars operate locally like a blackbody, it will be necessary to determine the wavelength at which the peak of emission in the continuum is greatest. Spectrum breakdown of light into its defining colors
By spotting patterns of spectral lines that correspond to specific chemicals, we may recognize the chemical elements that are present in the star. We may determine how fast a star is moving toward or away from us by comparing changes in the wavelengths of its spectral lines to those of the same lines measured in a laboratory on Earth.
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