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- 1. Multiple Choice
What are the spectral classes in order?
OABMFGK
ABFGKMO
OBAFGKM
MAFOBKG
- 2. Multiple Choice
Who proposed the Harvard System of stellar classification?
Williamina Fleming
Annie Jump Cannon
Edward Pickering
Thomas Harvard
- 3. Multiple Choice
Which of these could be the temperature of an F class star?
3000 K
7000 K
17 000 K
30 000 K
- 4. Multiple Choice
Which of these could be the temperature of an M class star?
3000 K
7000 K
17 000 K
30 000 K
- 5. Multiple Choice
What class is the Sun?
F
G
K
M
- 6. Multiple Choice
What class is an orange star?
A
F
G
K
- 7. Multiple Choice
What are the prominent absorption lines in an A class star?
H (strongest)
ionised metals
He+, He, H
ionised and neutral metals
neutral metals, TiO
- 8. Multiple Choice
What is the extra class, P, used for?
Planets
Black Holes
Supernovae
Planetary Nebulae
- 9. Multiple Choice
What is the temperature of a white star?
6500 K
8500 K
12 500 K
35 000 K
- 10. Multiple Choice
What are Balmer Lines?
Hydrogen lines from/to the n=1 energy level
Hydrogen lines from/to the n=2 energy level
Helium lines from/to the n=1 energy level
Helium lines from/to the n=2 energy level
- 11. Multiple Choice
What is the temperature of a star displaying absorption lines from ionised metals?
<3500 K
5000-11000 K
>11000 K
- 12. Multiple Choice
What is the temperature of a star displaying absorption lines from TiO?
<3500 K
5000-11000 K
>11000 K
- 13. Multiple Choice
Which colour star could be more than one spectral class?
Blue
Blue-white
white
yellow white
- 14. Multiple Choice
What is the order of spectral classes backwards?
OBAFGKM
FGKMABO
KMFGBAO
MKGFABO
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