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Hess diagram

(diagram relating effective temperature to luminosity)

A Hess diagram is a graph showing the density of occurrence of stars over the same axes as H-R diagrams: effective temperature versus luminosity. (The term may have been used for similar type density plots.) Richard Hess originated the concept in 1924, using lines like a typical drawn topographic map. Currently, it is common to use colors to indicate the densities.


(stars,astrophysics,temperature,luminosity,magnitude,diagram)
Further reading:
http://en.wikipedia.org/wiki/Hess_diagram
https://books.google.com/books?id=3pGhBgAAQBAJ&pg=PA265&lpg=PA265&dq=Die+Verteilungsfunktion+der+absoluten+Helligkeiten+in+ihrer+Abh%C3%83%C2%A4ngigkeit+vom+Spektrum
https://d-nb.info/1181441358/34

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