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Article Contents

TITLE PAGE

1.INTRODUCTION

2.GENERAL CHARACTERISTICS OF THE SPECTRA OF GALAXIES

2.1.Humason's Spectral Classification System

2.2.Criteria for a Spectroscopic Classification of Galaxies

3.THE SPECTRUM OF THE ANDROMEDA NEBULA (M 31)

3.1.The Spectrum of the Nuclear Region

3.2.A Hypothetical H-R Diagram for the Inner Region

3.3.The Spectrum of the Main Body

3.4.A Comparison of the Spectra of M 31 and M 33

4.SPECTRA OF IRREGULAR GALAXIES LIKE THE LARGE MAGELLANIC CLOUD

5.A SPECTRAL CLASSIFICATION OF GALAXIES

5.1.The A-systems

5.2.The AF-Systems

5.3.The F-Systems

5.4.The FG-Systems

5.5.The K-Systems

6.THE RELATIONSHIP BETWEEN FORM AND SPECTRUM

7.A POSSIBLE LUMINOSITY EFFECT IN THE SPECTRA OF THE K-SYSTEMS

8.CONCLUSION

REFERENCES