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Stellar Properties/Evolution Review Sheet Answers
1. Use the table to answer the following questions.
Star
Spectral Type
m
M
Procyon
Arcturus
Vega
Achernar
GL 725A
Canopus
 Centauri
F5
K2
0.37
-0.06
0.04
0.45
8.9
-0.62
0.01
2.6
-0.3
0.05
-2.77
11.16
-5.53
4.38
A0
B3
M3
A9
G2
a. Which star is the hottest? Achernar Coolest? GL 725A
b. Which star looks most red? GL 725A Most blue? Achernar
c. Which star is the most luminous? Canopus Least luminous? GL 725A
d. Which star appears the brightest? Canopus Faintest? GL 725A
e. Which star’s spectrum shows the strongest Balmer lines of Hydrogen? Vega
f. Which star’s spectrum most resembles the Sun’s?  Centauri
g. Which star is the closest (find m-M)?  Centauri (m-M = -4.37)
h. Which star has the smallest parallax angle? Canopus (m-M = 4.91)
i. Which star can’t be seen without the use of a telescope? GL 725A
j. How is it possible that Canopus is more luminous than Achernar, given their
respective spectral types?
Canopus is cooler than Achernar; therefore, the only way Canopus can be
more luminous is because it is LARGER.
2. List the evolutionary stages of the Sun’s life cycle & describe how its size (Radius),
temperature, and luminosity will change with each stage.
Protostar (size , temperature , luminosity )
Main Sequence (size, temperature, & luminosity all slightly)
Red Giant (size , temperature , luminosity )
White Dwarf (size , temperature , luminosity )
3. Reorder the stars according to the Harvard Spectral Classification System and then answer
the questions that follow.
Star
Spectral Type
Procyon
Arcturus
Vega
Achernar
Betelgeuse
Meissa
Polaris
 Centauri
F5
K2
Reordered Stars
(Star Names)
Meissa
(O8)
Achernar
(B3)
A0
Vega
(A0)
B3
M2
O8
F8
G2
Procyon
Polaris
 Centauri
Arcturus
Betelgeuse
(F5)
(F8)
(G2)
(K2)
(M2)
4. HR Diagram & Stellar Evolution – Circle the star that correctly answers each question.
Use the information found on the HR Diagram that has been provided to answer the
following questions.
Which of the following stars took the longest time to form?
Vega
Altair
Sun
Which of the following stars will live the shortest amount of time on the Main Sequence?
Sirius
Altair
Barnard’s Star
Which of the following stars has the smallest size?
Procyon B
Barnard’s Star
Sun
Which of the following stars is a stellar remnant?
Spica
Sirius B
Wolf 359
Which of the following stars is presently fusing Hydrogen into Helium in its core?
Arcturus
Bellatrix
Procyon B
Which of the following stars will eventually have a core made of Iron?
Sun
Rigel
Sirius B
Which of the following stars has the greatest chance of turning into a black hole?
Pollux
Barnard’s Star
Deneb
Which of the following stars is fusing Helium into Carbon in its core?
Altair
Sirius
Betelgeuse
Which of the following stars is most luminous?
Regulus(not there)
Proxima Centauri
Aldeberan
Which of the following stars most recently used up its core supply of Hydrogen?
Procyon
Pollux
Arcturus