. Compare: Study the HR diagram. - Which stars are white dwarfs? - What are the characteristics of white dwarfs? White dwarfs are near the end of their lives. They are the leftover cores of giants and supergiants. - Classify: Proxima Centauri is the nearest star to the Sun. It has a luminosity 0f0.0017 and a temperature of 3.000 K. - Which star group does Proxima Centauri belong to? - On the H-R diagram, which star would Proxima C entauri be near? Nguyen 5 - Describe: Locate the Sun on the H-R diagram. How will the Sun's luminosity and temperature change as it ages? How will these changes affect its position on the diagram? Part 1: Using H-R Diagram Open the H-R Diagram on Gizmos. Activity Get the Gizmo ready: Super Luminosity and Click Reset. temperature Select H-R diagram (from the circles). Introduction: In the early 1900s, two astronomers-Einar Hertzsprung and Henry Norris Russell-independently made a graph comparing star luminosity and temperature. This graph, now known as a Hertzsprung-Russell diagram, or H-R diagram, is still used today to classify stars into groups