G band

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Josef von Fraunhofer (1787—1826) German optician and pioneer in spectroscopy


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A broad Fraunhofer line in the Sun's spectrum at about 431 nm, due to absorption by CH molecules and a closely spaced group of lines produced by neutral iron. The same feature is found in other stars, most notably of spectral types F to K.

Subjects: Astronomy and Astrophysics.

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