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Transcript
s8pe-emapp-ca-R52-R64 12/13/05 3:14 PM MAZER Page R63 The Hertzsprung-Russell Diagram The Hertzsprung-Russell (H-R) Diagram is a graph that shows stars plotted according to brightness and surface temperature. Most stars fall within a diagonal band called the main sequence. In the mainsequence stage of a star’s life cycle, brightness is closely related to surface temperature. Red giant and red supergiant stars appear above the main sequence on the diagram. These stars are bright in relation to their surface temperatures because their huge surface areas give off a lot of light. Dim white dwarfs appear below the main sequence. HIGHEST THE H-R DIAGRAM BLUE SUPERGIANTS Rigel Betelgeuse Spica RED SUPERGIANTS Polaris <MA IN S EQU ENC E> Arcturus LUMINOSITY RED GIANTS Aldebaran Sirius Sun RED DWARFS WHITE DWARFS LOWEST Proxima Centauri TEMPERATURE APPENDIX HOTTEST COOLEST Appendix R63 PDF
