CONTENTS

[LECTURE I. THE INTERIOR OF A STAR][9]
[Temperature in the Interior][11]
[Ionization of Atoms][17]
[Radiation Pressure and Mass][24]
[The Interior of a Star][26]
[Opacity of Stellar Matter][28]
[The Relation of Brightness to Mass][31]
[Dense Stars][36]
[LECTURE II. SOME RECENT INVESTIGATIONS][42]
[The Story of Algol][42]
[The Story of the Companion of Sirius][48]
[Unknown Atoms and Interpretation of Spectra][53]
[Spectral Series][59]
[The Cloud in Space][63]
[The Sun’s Chromosphere][70]
[The Story of Betelgeuse][76]
[LECTURE III. THE AGE OF THE STARS][85]
[Pulsating Stars][85]
[The Cepheid as a ‘Standard Candle’][90]
[The Contraction Hypothesis][94]
[Subatomic Energy][99]
[Evolution of the Stars][106]
[Radiation of Mass][113]
[APPENDIX]
[Further Remarks on the Companion of Sirius][122]