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In our study of Stars The students will be able to Determine color, temp., brightness and Size of a star And show what they learned by Interpreting the.

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Presentation on theme: "In our study of Stars The students will be able to Determine color, temp., brightness and Size of a star And show what they learned by Interpreting the."— Presentation transcript:

1 In our study of Stars The students will be able to Determine color, temp., brightness and Size of a star And show what they learned by Interpreting the HR Diagram

2 WARM-UP

3 Scientists classify stars based on their brightness (Luminosity) And Temperature

4 Classifying Stars Astronomers classify stars according to: size/mass, temperature, color, and brightness.

5 How bright a star or galaxy shines is its brightness or luminosity

6 Draw this graph in your journal: Luminosity (Brightness) Temperature

7 Now add your numbers Along the edge of the graph Notice what happens to the numbers as we move from Left to Right.

8 Now add your numbers Along the edge of the graph Increasing Temperature

9 Now add your numbers Along the edge of the graph Hotter Colder

10 Now let’s look at Luminosity: Luminosity (Brightness) Temperature Dim Stars Bright Stars Increasing

11 Now let’s begin placing our different types of stars White Dwarfs (Dead Stars

12 Now let’s begin placing our different types of stars White Dwarfs (Dim Stars) Main Sequence Stars (Very stable in their life, Young to middle aged stars)

13 White Dwarfs (Dim Stars)

14 White Dwarfs (Dim Stars) Our Sun

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16 Star Temperatures Color of a star indicates its surface temperature Red stars are the ”coolest” while blue are the hottest Sun is a yellow star

17 17 Hertzsprung-Russell Diagram

18 27.2 The size of stars Stars come in a range of sizes and masses. Our Sun is a medium- sized star. The largest stars, giant stars have a mass of about 60 times the mass of the Sun.

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22 Which star is hottest supergiant?

23 What temperature is Sirius B?

24 Which star is the dimmest (least bright) on the chart?

25 Order these stars from hottest to coolest: Procyon, Spica, Sirius B, and Pollux


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