A Hess diagram plots the relative density of occurrence of stars at differing color-magnitude positions of the Hertzsprung-Russell diagram for a given galaxy.
The diagram is named after R. Hess who originated it in 1924.[1]
Its use dates back to at least 1948.[2]
References
1. ^ R. Hess (1924). "Die Verteilungsfunktion der absol. Helligkeiten etc.", Probleme der Astronomie. Festschrift fur Hugo v. Seeliger. Springer, Berlin, 265.
2. ^ Gaposchkin, Cecilia Payne (1948). "The connection of motion with intrinsic variability.". Astronomical Journal 53: 193.
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