TEK Review of HR Diagrams

Background Info The Hertzsprung-Russell diagram is actually a graph that illustrates the relationship that exists between the average surface temperature of stars and their absolute magnitude, which is how bright they would appear to be if they were all the same distance away. Rather than speak of the brightness of stars, the term “luminosity” is often used. Luminosity is a measure of how much energy leaves a star in a certain period of time. HR Diagram Video Read the background information and watch the video before answering the questions. What determines the color of a star? size temperature Both HR Diagram - Use the picture to answer the following questions! What is the approximate surface temperature of the sun? 6500 K 5700 K 3500 K The surface temperature of a white dwarf is higher than a red super giant. True False What is the color of stars with the hottest surface temperature? red yellow blue white What is the color of stars with the lowest surface temperature? red yellow blue white Most of the stars on the HR diagram are classified as what type of star? white dwarf blue super giant main sequence red giant What type of star has a high temperature but a low luminosity? Blue Giant White Dwarf Main Sequence Red super giant What type of star has a high temperature and a high luminosity? Blue Giant White Dwarf Main Sequence Red Supergiant What type of star has a low temperature but a high luminosity? Blue Giant White Dwarf Main Sequence Red Supergiant What type of star has a low temperature and a low luminosity? Blue Giant White Dwarf Main Sequence Red Super Giant