So in the astrophysics textbook by Carrol and Ostlie, when the luminosity class is discussed, it has such a sentence "The ratio of the strengths of two closely spaced lines is often employed to place a star in the appropriate luminosity class. " I'm not exactly sure what this means. Wouldn't the two lines both be broadened in the lower luminosity class? So why would the ratio give us any indication of any broadening?
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