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What does HR stand for?

HR stands for Hertzsprung-Russell (Diagram)

This definition appears very frequently

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We have 67 other meanings of HR in our Acronym Attic

Samples in periodicals archive:

5 Analogues of the Hertzsprung-Russell (H-R) diagram and their applications The Hertzsprung-Russell (H-R) diagram shows the evolutionary position of stellar objects on the "spectral class (temperature)--luminosity" coordinate plane.
UK) present the proceedings of a November 2008 workshop bringing together researchers studying the morphologically separated, yet evolutionarily connected, stars in the upper blue and red sections of the Hertzsprung-Russell diagram, which have typically been studied separately in spite of their connections.