* This paper is dedicated to my father, William Thomas Morgan (1877-19??). You will never know what I owe you.

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THE MK SYSTEM AND THE MK PROCESS

W.W. MORGAN*


Yerkes Observatory
University of Chicago

At some point one has to pass from
explanation to mere description.

L. WITTGENSTEIN, On Certainty


Abstract. A methodology is described that permits the development of new spectral classification systems that would supplement the MK System by making possible accurate classification of Population II stars, and other eccentric categories of stellar spectra.


Table of Contents

INTRODUCTION

THE MK PROCESS

MACROSCOPIC PROPERTIES OF THE MK PROCESS

THE ACT OF SPECTRAL CLASSIFICATION ACCORDING TO THE MK PROCESS

FRAGMENTS OF TWO NON-MK SYSTEMS

TERMINOLOGY FOR WEAK-METALLIC-LINE CLASSIFICATION SYSTEMS

AN ALTERNATIVE PROCEDURE IN SPECTRAL CLASSIFICATION

SPECTRA SHOWING THE STELLAR-WIND LINE HE I 3888

FURTHER CLASSIFICATION OF CATEGORIES LIKE THE HE I 3888 "WIND-LINE" STARS

GENERALITIES CONCERNING THE NATURE OF THE SUPPLEMENTARY SYSTEM

SUMMARY

PENDANT: MORPHOLOGY OF SPECTRAL FORMS

ACKNOWLEDGEMENTS & REFERENCE

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