Astronomy 120 - Stars and Galaxies » Fall 2022 » Unit 7 Quiz

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Question #1
The least luminous stars are those of luminosity class .
A.   0
B.   VII
C.   L.L.
D.   I
Question #2
For main sequence stars, the hotter the star, the less massive it is.
A.   True
B.   False
Question #3
Luminosity can be described as
A.   the intensity of the star times the star's surface area.
B.   the energy emitted from star, per meter square, per second
C.   the intensity of the starlight.
D.   the amount of light we measure from the star every second.
Question #4
Which of the following main sequence stars would be the smallest and most red?
A.   A0
B.   M1
C.   B5
D.   G2
Question #5
Rigel's apparent magnitude is +0.2, and its absolute magnitude is –6.8. Use the spectroscopic parallax distance method to calculate how far Rigel is from us, in pc. Give your answer as a simple number (no units).
A.   Between 250 and 260
B.   Between 280 and 300
C.   Between 150 and 160
D.   Between 200 and 230
Question #6
A newly discovered star is observed to have narrow hydrogen lines (the Fraunhofer lines caused by electron transitions within hydrogen atoms). This indicates that the star is most likely a .
A.   supergiant
B.   white dwarf
C.   main sequence star
D.   None of these choices.
Question #7
The HR Diagram plots the stars' luminosity on the y-axis versus its on the x-axis.
A.   absolute magnitude
B.   mass
C.   apparent magnitude
D.   temperature

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