Classification of Stellar Spectra: Hertzsprung-Russell Diagram and Colour-Magnitude Diagram
When, following the discoveries of J. Fraunhofer, G. Kirchhoff and R. Bunsen, the observation of stellar spectra was begun, it soon appeared that in the main these could be arranged in a one-parameter sequence. The associated change of colour of the stars, or of their colour indices, showed the arrangement to be in order of decreasing temperature.
KeywordsColour Index Absolute Magnitude Spectral Type Main Sequence Bright Star
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Theory of Fraunhofer Lines; Chemical Composition of Stellar Atmospheres
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