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Name: _____________________________ Block: ________ Date: _______________________________ EARTH SCIENCE 11 Lab 21.1 Classifying Stars Objective: Using a Hertzsprung-Russell Diagram: 1. Plot and classify stars according to intrinsic brightness and temperature 2. Note the relationship between a star’s mass and its brightness 3. Classify stars into the five main groups 4. Learn how to graph on log paper Materials: List of 20 brightest stars List of 36 closest stars Blank graph Pencil Procedure: 1. 2. 3. 4. 5. Groups of two (maximum), but each person does the lab. Note the position of the Sun: temperature = 5,000C Plot the 36 closest stars on the graph paper and mark each star’s location with a small “x”. Plot the 20 brightest stars on the graph paper and mark each star’s location with a small “o”. Using the diagram on page 382 of the text, label the five groups (four of them are circled). The third group from the top of the page is not in the text and is called Subgiants. 6. Answer the questions that follow below, directly onto this sheet. 7. Hand in on due date. Questions: 1. Compare the star’s mass to its luminosity and to its temperature. Can you find any basic relationship between these traits? (i.e. the greater the mass, the ….) _____________________ ______________________________________________________________________________ 2. (a) What is a red giant? ___________________________________________________________ (b) Give examples. ____________________________ & ________________________________ 3. How are supergiants different from red giants? 100’s of times__________________ Name: _____________________________ Block: ________ Date: _______________________________ EARTH SCIENCE 11 4. (a) What are white dwarfs? _______________________________________________________ (b) How does their density compare to that of Earth? ___________________________________ 5. Variable stars: (a) What are they? ______________________________________________________________ (b) Cepheid variables are used to measure ____________________ in space. (c) An eclipsing binary is when ______ stars ___________________ around each other. 6. Pulsars: (a) Give off powerful ___________________ ______________________. (b) are the remaining core of a ___________________ star after a huge explosion in space that is called a _________________________. Name: _____________________________ Block: ________ Date: _______________________________ EARTH SCIENCE 11 Name: _____________________________ Block: ________ Date: _______________________________ EARTH SCIENCE 11 Name: _____________________________ Block: ________ Date: _______________________________ EARTH SCIENCE 11