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Remarks on the MK System*

Published online by Cambridge University Press:  12 April 2016

W. W. Morgan
W. W. Morgan*
Affiliation:
Yerkes Observatory, University of Chicago

Extract

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The principal domain for the determination of the fundamental reference stars is K - Hβ (3930 - 4860 Å/mm). A certain amount of classification has been carried out in the visual and near ultraviolet regions; however, in neither case has a serious attempt been made to go to the practicable limit in accuracy. It can thus be said that the “field” for the determination of the fundamental MK standards has been K - Hβ.

Type
II Criteria and Applications of MK Classification
Information
International Astronomical Union Colloquium , Volume 47: Spectral Classification of the Future , 1979 , pp. 59 - 61
Copyright
Copyright © Vatican Observatory 1979

Footnotes

*

These comments are based on consideration of spectra earlier than the Sun. The Keenan-McNeil Atlas of Spectra of the Cooler Stars should be consulted for the classification of stars of later type.

References

* These comments are based on consideration of spectra earlier than the Sun. The Keenan-McNeil Atlas of Spectra of the Cooler Stars should be consulted for the classification of stars of later type.