Published in PASP 69, 1957.
A SPECTRAL CLASSIFICATION OF GALAXIES *
W. W. Morgan & N. U. Mayall
Lick Observatory,
University of California
Table of Contents
INTRODUCTION
- GENERAL CHARACTERISTICS OF THE SPECTRA OF
GALAXIES
- Humason's Spectral Classification System
- Criteria for a Spectroscopic Classification of
Galaxies
- THE SPECTRUM OF THE ANDROMEDA NEBULA (M 31)
- The Spectrum of the Nuclear Region
- A Hypothetical H-R Diagram for the Inner Region
- The Spectrum of the Main Body
- A Comparison of the Spectra of M 31 and M 33
- SPECTRA OF IRREGULAR GALAXIES LIKE THE LARGE
MAGELLANIC CLOUD
- A SPECTRAL CLASSIFICATION OF GALAXIES
- The A-systems
- The AF-Systems
- The F-Systems
- The FG-Systems
- The K-Systems
- THE RELATIONSHIP BETWEEN FORM AND SPECTRUM
- A POSSIBLE LUMINOSITY EFFECT IN THE SPECTRA OF THE
K-SYSTEMS
- CONCLUSION
- REFERENCES
* Contributions from the Lick Observatory, Ser. II, No. 79.
