Answer the questions using the above HR Diagram 1. What is the approximate surface temperature of the sun? 6000 Degrees Celsius 2. Would the surface temperature of white dwarf stars be higher or lower than red supergiants? (Circle one of the bold words) Higher 3. What is the colour of the stars with the highest surface temperature? Blue 4. What is the colour of the stars with the lowest surface temperature? Red 5. List the colour of the stars from hottest to coldest. Blue, green, yellow, orange, red 6. Most of the stars on the HR Diagram are classified as which type of star? Main sequence star 7. How is it possible for white dwarf stars to have lower luminosity than the sun even though the sun is cooler than white dwarfs? The luminosity of a star depends on how large and hot it is. Since the sun is much larger than the white dwarfs it has a higher luminosity. 8. Plot the following stars. Star A = 4,000 degree C and low/medium brightness Star B = 6,000 degree C and high brightness Star C = 20,000 degree C and low/medium brightness Star D = 6,000 degree C and medium brightness Identify the type/colour for each star: Star Colou r Type Star A Orange Red dwarfs Star B Green Blue to red supergiants Star C Blue White dwarfs Star D Green Sun 9. What is the name of our most popular star located at point D? Main sequence stars? 10. Describe the characteristics of stars in the area called Main Sequence. What do all types of stars located here have in common? 6000-10,000 degrees C surface temperature, Medium Luminosity, Blue/green colour