Download Astro 1 & 100 Levine Homework Stars Name:____________________________

Astro 1 & 100
Levine
Homework Stars
Name:____________________________
______/29
Part I — Properties of Stars
You may want to do the lecture-tutorial on pg 33, Apparent and Absolute Magnitude of
Stars, prior to doing this portion of the homework, if you need a refresher on m and M.
Ranking questions are 2 points each. Consider the following table of stars:
ID for
ranking
Name
Apparent
Absolute
Spectral Class m-M
magnitude (m) magnitude (M)
(complete
this)
SB
Sirius B
8.3
11.2 B4-B5
Sph
Saiph
2.1
-6.1 B0-B1
AC
Alpha Centauri
A
Vga
Vega
Btl
G75
-0.01
4.4 G2
0
0.6 A0
Betegeuse
0.5
-7.2 M2
Gl 75
5.6
5.6 K0
1. Rank these stars in order of luminosity, from brightest to dimmest :
Brightest ______ ______ ______ ______ ______ ______ Dimmest
Or, all have the same luminosity ______________
2. Rank these stars in order of apparent brightness, from brightest to dimmest:
Brightest ______ ______ ______ ______ ______ ______ Dimmest
Or, all have the same apparent brightness ______________
3. Rank these stars in order of distance from the Sun, from closest to farthest (Hint:
you only need to know m — M to figure this out!)
Closest ______ ______ ______ ______ ______ ______ Farthest
Or, all are at the same distance ______________
4. Rank these stars in order of color from reddest to bluest:
Reddest ______ ______ ______ ______ ______ ______ Bluest
Or, all have the same color ______________
5. Rank these stars in order of temperature from hottest to coolest:
Hottest ______ ______ ______ ______ ______ ______ Coolest
Or, all have the same temperature ______________
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Astro 1 & 100
Levine
Homework Stars
Part II The H-R Diagram
6. On the blank HR diagram, above, mark the location for each of the stars in the Star
Table and label them. (6 points).
7. Draw a line to represent the main sequence. (2 points)
8. Mark the location of the Sun and label it (it’s a G-type star). (2 points)
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Astro 1 & 100
Levine
Homework Stars
9. Which of the stars from the Star Table are main sequence stars? (2 points)
10. Which of the stars from the Star Table are red giants or red supergiants? (2 points)
11. Which of the stars from the Star Table are white dwarfs? (2 points)
12. Which of the stars from the Star Table is most similar to the Sun? (2 points)
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Astro 1 & 100
Levine
Homework Stars
Part III-- Stellar Evolution
13. Fill out the following diagram with the evolutionary stages given in the box. (5
points)
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