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H-R Diagram Star Classification Guide

The lines of equal radius should go diagonally from the top left to bottom right of the H-R diagram. Stars with higher luminosity (toward the top) and higher temperature (toward the left) will have larger radii. Stars with lower luminosity (toward the bottom) and lower temperature (toward the right) will have smaller radii.

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166 views3 pages

H-R Diagram Star Classification Guide

The lines of equal radius should go diagonally from the top left to bottom right of the H-R diagram. Stars with higher luminosity (toward the top) and higher temperature (toward the left) will have larger radii. Stars with lower luminosity (toward the bottom) and lower temperature (toward the right) will have smaller radii.

Uploaded by

mimi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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B G

Supergiants

White Dwarfs

E D

Part 1: Areas on the H-R diagram

For the following circle the name of the area on the H-R diagram where you would find each type of
star. If more than one word describes the area, for example the top right corner, circle both words.

1. bright stars: top bottom left right center


2. hot stars: top bottom left right center
3. hot bright stars: top bottom left right center
4. cool dim stars: top bottom left right center
5. sun - like stars: top bottom left right center

Part 2: Plotting Stars

Mark each of the following on the H-R diagram and label it as indicated.

7. A line showing the approximate location of the main sequence (no label).
8. A blue main sequence star labeled B
9. A red dwarf main sequence star labeled D
10. A sun-like star labeled S
11. A red giant the same color as D and the same brightness as B labeled G
12. A white dwarf the same color as B and the same brightness as D labeled E
13. A large circle indicating the area where you find the biggest diameter stars, labeled
supergiants
14. A large circle indicating where you would find white dwarfs, labeled white dwarfs

Part 3: Getting Information from the H-R Diagram

13. Stars B and G have the same brightness. Does this mean they are the same temperature? Why
or why not? No. Luminosity does not determine temperature – they can be bright, but still
cool.

14. Stars D and G have the same color. Does this mean they are the same temperature? Why or
why not? No. Color is not determined by temperature, but by magnitude.

15. What is different about star G that allows it to be the same color as D but as bright as B?
Explain. B is a blue main sequence star, which tends to be the largest of the main sequence
stars. G is a red giant. Their similar size allows them to have the same luminosity.

16. How can E be as hot as B, but so dim? E is a white dwarf; these stars are located below the
main sequence. No fusion takes place in their core to convert the energy required to emit a
similar luminosity to a blue main sequence star.

17. What will happen to E as it continues to cool off? Why? Draw an arrow on the H-R diagram to
show this change. As it cools off, it will continue to dim.
18. Place four dotted lines on the chart to show lines of equal radius. Explain how you decided
what orientation the lines should go.

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