What Does HR Stand For?

HR stands for Hertzsprung Russell

HR, or Hertzsprung-Russell, refers to a pivotal diagram in astrophysics that categorizes stars based on their luminosity and temperature. Developed independently by astronomers Ejnar Hertzsprung and Henry Norris Russell in the early 20th century, the diagram helps illustrate the relationship between a star's brightness, color, and evolutionary stage. It is a fundamental tool in understanding stellar evolution and classifying stars into distinct groups, such as main sequence stars, giants, and supergiants.

Other Meanings for HR