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Answer the question on the file.For both page
hw_hr_diagram.pdf

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Homework: Luminosity, Temperature, Radius/HR Diagrams
Part 1:
Instructions: Answer the following questions.
1. Two stars are the same color. Star X is brighter than Star Y. Which one is bigger?
2.
Star X is hotter than Star Y. They are both the same brightness. Which one is bigger?
3.
Star X is red and Star Y is blue. Both are the same brightness. Which one is bigger?
4.
Star X is red and Star Y is blue. Star X is brighter than Star Y. Which one is bigger?
5.
Star X is blue and Star Y is yellow. Star X is brighter than Star Y. Which one is bigger?
Part 2:
Instructions: Use the H-R diagram below to answer the following questions.

A


C
E
1.
Which stars are the same brightness?
2.
Which stars are the same temperature?

B
3.
Compare Star A and Star B. Which one is bigger?
Explain how you know.

F
4.
Compare Star A and Star C. Which one is bigger?
Explain how you know.
5.
Compare stars B, F, and D. Rank them from largest to
smallest. Explain your logic.
6.
On the diagram draw a dot to represent Star G that is
the same temperature as Star A, but less bright. How
does the size of Star A compare to Star G?

D
7.
On the diagram draw a dot to represent Star H that is the same temperature as Star D, but
smaller.
8.
On the diagram draw a dot to represent Star J that is brighter and larger than Star A.
Part 3:
Use the H-R Diagram below to answer the following questions (NOTE: Dot size does not represent
anything)
1. What is the spectral type, luminosity, and temperature of star A?
2.
What two stars in the diagram have (approximately) the same temperature?
3.
Do stars of the same spectral type have the same temperature? Explain how you know.
4.
What two stars in the diagram have (approximately) the same luminosity?
5.
Do stars of the same spectral type have the same luminosity? Explain how you know.
6.
For each of the star descriptions
below, state whether the star
would be a red giant, white
dwarf, or main sequence star.
Also write which star from the
H-R diagram would fit the
description.
a) very bright and very hot
Red Giants
1,000 —
10 —
Main Sequence
b) very dim and cool
c) very dim and very hot
0.1 —
White Dwarfs
d) very bright and cool
0.01 —

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