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Hertzsprung- Russell Diagram. H-R Diagram Compares the temperature, color and luminosity (brightness) of stars on a graph. The temperature is the surface.

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Presentation on theme: "Hertzsprung- Russell Diagram. H-R Diagram Compares the temperature, color and luminosity (brightness) of stars on a graph. The temperature is the surface."— Presentation transcript:

1 Hertzsprung- Russell Diagram

2 H-R Diagram Compares the temperature, color and luminosity (brightness) of stars on a graph. The temperature is the surface temperature of the star The brightness of the star is its absolute magnitude

3 APPARENT MAGNITUDE VS. ABSOLUTE MAGNITUDE Apparent magnitude Absolute magnitude Measure of the amount of a star’s light received on Earth Measure of the amount of light a star actually gives off

4 STAR PROPERTIES Color indicates temperature Hot stars are Cool stars are YellowMedium temperature stars are Blue Red

5 White dwarfs small, hot stars leftover centers of old stars

6 Red-Giants When star runs out of energy, the center shrinks and the outer part expands outward. It will grow very large and cool.

7 Supergiants Very massive cool giant star

8 Main Sequence Stretches diagonal from the top left to the right bottom Our sun is an average main sequence star

9 Blue Supergiants Very massive blue stars Quickly use up energy and turn into Giants or Supergiants

10 Red Dwarfs Low-mass stars Oldest stars in galaxy

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13 Putting it all together H-R Diagram AND Life Cycle


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