Astronomy 154 - Elementary Astronomy » Spring 2022 » Assignment 6

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Question #1
If Star A is closer to us than Star B, then Star A's stellar parallax is __________.
A.   cooler than that of Star B.
B.   hotter than that of Star B.
C.   larger than that of Star B.
D.   fewer parsecs than that of Star B.
E.   smaller than that of Star B.
Question #2
Ten parsecs is about ___________.
A.   10 seconds of arc
B.   33 thousand years
C.   10 thousand seconds
D.   66 million kilometers
E.   33 light-years
Question #3
According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?
A.   Its apparent brightness will decrease by a factor of 9.
B.   Its apparent brightness will remain the same.
C.   Its apparent brightness will increase by a factor of 9.
D.   Its apparent brightness will decrease by a factor of 3.
E.   Its apparent brightness will increase by a factor of 3.
Question #4
At what distance must a star be to have its apparent magnitude equal to its absolute magnitude?
A.   10 pc
B.   1 Mpc
C.   1 AU
D.   10 AU
E.   1 pc
Question #5
A star has an apparent magnitude of 3.0 and is located at a distance of 2.5 pc. If this star were located at the standard distance of 10 pc, it would appear to be _____ to us. Therefore its absolute magnitude will be _____ 3.0.
A.   brighter, greater than
B.   brighter, less than
C.   dimmer, greater than
D.   dimmer, less than
Question #6
Stars with the same spectral class will have the same ___________.
A.   luminosity
B.   radius
C.   luminosity class
D.   surface temperature
E.   mass
Question #7
Can a cool star be more luminous than a hot star?
A.   Yes, if the cool star is farther from Earth than the hot star.
B.   Yes, if the cool star is larger than the hot star.
C.   Yes, if the cool star is smaller than the hot star.
D.   Yes, if the cool star is more dense than the hot star.
E.   Yes, if the cool star is closer to Earth than the hot star.
F.   No.
Question #8
The axes on a Hertzsprung-Russell (H-R) diagram represent ____________.
A.   mass and radius
B.   luminosity and temperature
C.   temperature and radius
D.   mass and luminosity
E.   absolute brightness and radius
F.   luminosity and apparent brightness
Question #9
The luminosity class of the star Alphard is II which means that:
A.   Alphard is in the constellation of Hydra.
B.   Alphard is 180 light years away.
C.   Alphard is a bright giant.
D.   Alphard has a surface temperature of 4400K.
E.   Alphard has a luminosity 400 times that of the Sun.
Question #10
Each choice below lists a spectral type and luminosity class for a star. Which one is a red supergiant?
A.   Spectral type G2, luminosity class V
B.   Spectral type A5, luminosity class II
C.   Spectral type M2, luminosity class I
D.   Spectral type O9, luminosity class I
E.   Spectral type M1, luminosity class III
Question #11
Two stars with the same luminosity class will have the same luminosity.
A.   True
B.   False
Question #12
What is the distance to a star that has an apparent magnitude of 1.5 and an absolute magnitude of -3.5?
A.   100 pc
B.   50 pc
C.   10 pc
D.   5 pc
E.   25 pc
Question #13
A star with lumosity class III has a surface temperature of 9,000 K. What is its absolute magnitude?
A.   -3
B.   -7
C.   +2
D.   0
E.   -10
Question #14
A ______________ binary system in which both stars can be observed distinctly as they obit each other.
A.   parallel
B.   galactic
C.   visual
D.   polar
Question #15
Enter the spectral classes in order from hottest to coolest. Put NO SPACING between the letters. For example: WEISFUN
A.   OBAGFMK
B.   OBAFGKM
C.   OBAFOKM
D.   OBAFGBM
Question #16
A pair of stars which orbit each other is called a _________ star system.
A.   binary
B.   parallax
C.   parallel
D.   perihelion
Question #17
The properties of ____________ binary systems are detected by examining a light curve.
A.   luminous
B.   spectral
C.   eclipsing
D.   visual
Question #18
We can detect the binary nature of a _______________ binary star system by the dopler shifts in its spectral lines.
A.   parallax
B.   visual
C.   perihelion
D.   spectroscopic
Question #19
The total amount of energy a star radiates in one second is called its ___________.
A.   luminosity
B.   radiance
C.   spectral
D.   density
Question #20
The angular shift of a star as seen from locations on Earth's orbit separated by one astronomical unit is referred to as that star's ____________.
A.   focus
B.   stellar parallax
C.   semimijor axis
D.   stellar perihelion

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