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What does HRD stand for?

HRD stands for Hertzsprung-Russell Diagram (astronomy)

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We have 90 other meanings of HRD in our Acronym Attic

Samples in periodicals archive:

This proves the results, for example: the definition of the independent determination of the ultimate density of physical vacuum [3], the explanation of the nature of electron charge and finding its numerical value as well as numerical values of the constants of radiation [7, 9], the determination of the proton-electron mass ratio, the accounting of the forces of gravity in microcosm, the finding the neutron lifetime [8], the modeling the Hertzsprung-Russell diagram, the definition of model parameters of pulsars [6], the conclusion about the existence of two types of planetary systems [10], etc.
The contraction towards dense cores, which must get rid of their increasing thermal energy through molecular line radiation, is treated, discussing also how development appears on a Hertzsprung-Russell diagram (in the case of low-mass stars)-e.