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Unit 2: Lesson 5- Classifying stars

Unit 2: Lesson 5- Classifying stars. SWBAT: Plot and analyze stars according to their temperature and luminosity. WOD : main sequence star- hot luminous star during the longest stage of its life. Our sun is a main sequence star.

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Unit 2: Lesson 5- Classifying stars

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  1. Unit 2: Lesson 5- Classifying stars SWBAT: Plot and analyze stars according to their temperature and luminosity. WOD: main sequence star- hot luminous star during the longest stage of its life. Our sun is a main sequence star. Initial Activity:Why do you think some stars in the sky are brighter then others? Write down the reasons you think would make a star more or less bright. Mini Lesson: How can the HR diagram be used to analyze stars in relation to our sun? Activity: Lab groups- Lab #6- analyzing the HR diagram Summary: How can this diagram help us understand the relationship between temperature and luminosity?

  2. Stars are classified according to their luminosity and temperature. • Luminosity: measurement of how bright a star shines. • Brighter stars are more luminous then dimmer stars. • The larger a star is the more luminous it is. • Which of these stars is the most luminous? • 2nd most? How are stars classified?

  3. The color of a star is directly related to its temperature. • Stars can be blue, white, yellow, or red depending on how hot they are. Colors of Stars

  4. Today you will only complete steps 1 & 2 of the procedure • You will plot points on a graph called the Hertzsprung-Russell Diagram • Use a point to represent each star and label the point with the stars name. • Exit ticket: Copy the question and circle the correct answer on your weekly exit ticket sheet. Compared to our sun, the star Betelgeuse is • smaller, hotter, and less luminous • Smaller, cooler, and more luminous • Larger, hotter, and less luminous • Larger, cooler, and more luminous We will discover through this lab how temperature affects luminosity of a star:

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