- Hess diagram
A Hess diagram plots the relative density of occurrence of stars at differing color-magnitude positions of the
Hertzsprung-Russell diagramfor a given galaxy.
The diagram is named after R. Hess who originated it in 1924. [cite book| author = R. Hess | year = 1924 | page = 265 | chapter = Die Verteilungsfunktion der absol. Helligkeiten etc. | title = Probleme der Astronomie. Festschrift fur Hugo v. Seeliger | publisher = Springer, Berlin]
Its use dates back to at least 1948.cite journal
author=Gaposchkin, Cecilia Payne
title=The connection of motion with intrinsic variability.
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