HR Diagrams AND MORE

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 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 Fill in the blanks. The Sun is a medium - sized star located in the center of our solar system . The Sun is located in a spiral arm of the Milky Way galaxy. Of the 50 stars closest to Earth, the Sun is the fourth largest in mass . The closest star to Earth is the Sun . It takes light a little over eight minutes to reach Earth’s surface from the Sun. Milky Way Galaxy Draw the Milky Way galaxy and the Sun's position in it. Fill in the Blanks 2 A star is a large ball of gas that generates its own energy. This energy is created by the fusion of hydrogen atoms to make helium . This process produces tremendous amounts of energy , some of which is visible light . Stars are held together by the force gravity . Size and composition determine the amount of energy gravity associated with each star. The Herztsprung–Russell diagram is a scatter graph of stars showing the relationship between a star’s brightness and its surface temperature .