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Name:_______________________________ Period:_______________ Classifying the Stars Brightness Stars give off different amounts of light depending on their size and temperature. Characteristics of Stars Surface Temperature The coolest stars have temperatures of 3,000°C. The hottest stars have temperatures of up to 50,000°C. Color The color of a star is determined by its temperature. Cooler stars are red and the hottest stars are blue. DULL Mid-RANGE BRIGHT Instructions: 1. Test your knowledge of stars by completing the data table on the next page. You will use the H-R Diagram to find the types, temperatures, brightness, and colors of the stars. Name Type of Star Temp. °C (Approximate) Color Brightness Polaris Dull Mid-Range Bright Rigel Dull Mid-Range Bright Sirius A Dull Mid-Range Bright Sirius B Dull Mid-Range Bright Sun Dull Mid-Range Bright Alpha Centauri A Dull Mid-Range Bright Alpha Centauri B Dull Mid-Range Bright Aldebaran Dull Mid-Range Bright Algol Dull Mid-Range Bright Betelgeuse Dull Mid-Range Bright Answer the following questions. You may use the information on page 290 in your science book to help you. 1. What does the term luminosity mean? 2. Where on the H-R Diagram do stars spend the majority of their life? 3. What is the name of the hottest and brightest supergiant star on the H-R Diagram on this handout? 4. In the Main Sequence stars, what is the relationship between brightness and temperature? 5. Give the name of one star that is hot and not very bright according to the H-R Diagram on this handout.