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What does HRD stand for?

HRD stands for Hertzsprung-Russell Diagram (astronomy)

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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.
[ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] Equally economic is the Hertzsprung-Russell diagram, used in astronomy to describe the way stars live out their lives as reflected in changes that occur in their temperature, size and luminosity.