Hertzsprung Russell Diagram

HR Diagrams

By Edge

HR Diagrams show temperature/color in relation to relative brightness.

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HR Diagrams

Most stars live in the main sequence for the majority of their lives. Our star is a yellow star within this main sequence.

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Main Sequence

Blue Giants are massive, fast burning stars that are the hottest and brightest in our universe. They use up their fuel quickly (relative to other stars).

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Blue Giants

Red Giants are massive, relatively cool stars. our star will become a red giant after the hydrogen is gone. Blue giants turn into red SUPERgiants at the end of their hydrogen.

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Red Giants

White dwarfs are small, white, very hot stars. Our star will become a white dwarf after the reg diant phase.

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White Dwarfs

The closer to the Y axis, the hotter the star. Thus, white dwarfs and blue giants are the hottest stars.

The further from the Y axis, the cooler the star. Red giants are large, but very cool.​

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Temperature

Brightness on the HR diagram increases the further you get from the X axis. Blue and red giants are the brightest stars mainly due to their size; not temperature!

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Brightness

Multiple Choice

Which quadrant has the hottest, dimmest stars?

• Quadrant 1

• Quadrant 2

• Quadrant 3

• Quadrant 4

Multiple Choice

What is the name of the stars located in quadrant 2?

• Main Sequence

• White Dwarfs

• Red Giants

• Blue Giants

Multiple Choice

Where would our sun be located?

• Quadrant 1

• Quadrant 2

• Quadrant 3

• Quadrant 4

Multiple Choice

Where would blue giants be found?

• Quadrant 1

• Quadrant 2

• Quadrant 3

• Quadrant 4

Multiple Choice

What section is considered the main sequence?

• Area M

• Area P

• Area X

• Area Z

Multiple Choice

Where are red giants?

• Area M

• Area P

• Area X

• Area Z

Multiple Choice

Where are white dwarfs?

• Area M

• Area P

• Area X

• Area Z

GREAT JOB!!!! Looks like you know your STAAR stars now!!!!

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