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Name ________________________________ Date ________________ Period _______ LAB ACTIVITY The Hertzsprung-Russell Diagram Small Stars Massive Stars ! 6,000 8,000 30,000 0.0001 0.0005 0.001 0.005 0.01 0.05 0.1 0.5 1 10 5 50 100 500 5,000 10,000 50,000 100,000 20,000 DWARFS 10,000 MA Luminosity 500,000 1000 (Number of times brighter than the sun) 1,000,000 Surface Temperature (K) 4,000 E NC QU E SE IN Characteristics of Stars SUPERGIANTS GIANTS 3,000 Color 2,000 Please visit www.HMXEarthScience.com/hr_diagram_lab.html and follow the instructions to complete the activities below. Conclusion Questions 1. Which four properties does the HR diagram use to classify stars? 1. ________________________________________________ 2. ________________________________________________ 3. ________________________________________________ 4. ________________________________________________ 2. How many types of stars are shown on the HR Diagram? ___________________________ 3. Which of the stars you plotted was the brightest? ____________ hottest? ____________ 4. As a star changes color from red to blue, describe what happens to its surface temperature?___________________________________________________________________ 5. A Main Sequence star that is 10,000 times more luminous than the sun, most likely has a temperature of _________________________________________________________________ 6. What color is a Main Sequence star that is 1000 times brighter than the sun? _______________________________________ 7. According to the HR diagram, a massive star with a surface temperature of 20,000 K that is nearly a million times brighter than the sun would mostly likely be classified as a ________________________________________ 8. Which type of star is dimmer than the Sun? _________________________________________ 9. How does the temperature and luminosity of the Sun compare to that of the other stars on the Main Sequence? ________________________________________________________ 10. What is the relationship between luminosity and temperature for stars on the Main Sequence? _____________________________________________________________________