Table of Contents: “... Exercises -- 9. Stellar Spectra -- 9.1 Measuring Spectra -- 9.2 The Harvard Spectral Classification -- 9.3 The Yerkes Spectral Classification -- 9.4 Peculiar Spectra -- 9.5 The Hertzsprung-Russell Diagram -- 9.6 Model Atmospheres -- 9.7 What Do the Observations...”

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