Table of Contents

I. Definitions and Specisal Conditions in Astronomical Photometry II. Stellar Photometry and Colorimetry III. Astronomical Spectrographs IV. Description and Initial Classification of Stellar Spectra V. Spectra and Absolute Magnitudes VI. Continuous Spectra of the Stars, Gradients and Color Temperatures VII. Spectrophometric Classification of Stars VIII. Diameters and Effective Temperatures of the Stars IX. Masses and Densities of the Stars X. Elementary Ideas on the Constitution of Stellar Atmospheres Physical and Astronomical Constants Abbreviations of the Names of Constellations Cited Brief Bibliography Index

About the Author

French astronomer Jean Dufay (1896-1967) computed the altitude of the earth's ozone layer and was named Honorary Director of the Lyon and Haute-Provence observatories.Translator Owen Gingerich is a former Research Professor of Astronomy and the History of Science at Harvard University.