Ch. 11b Stellar Distance and Motion

The longest living stars are those of
1. high mass.
2. low mass.
3. intermediate mass.
The distances to a star can be found by
1. Doppler shifting.
2. temperatures.
3. parallax.
4. sonar echoing techniques.
We do not see stars in the daytime because
1. of the lack of contrast with moonlight.
2. they simply don't exist in the daytime part of the sky.
3. skylight overwhelms starlight.
4. the Sun blocks their view.
The H-R Diagram, an important tool of astronomers, relates stellar temperature to stellar
1. color.
2. distance.
3. brightness.
4. mass.
The temperature of a star is evidenced by its
1. brightness.
2. rate of burning.
3. distance.
4. color.
The brightness of a star as seen from the Earth is its
1. total output.
2. apparent magnitude.
3. absolute magnitude.
4. apparent output.
A magnitude 11 star is _____ than a magnitude 3 star.
1. brighter
2. hotter
3. dimmer
4. cooler
A red star is _____ than a blue star.
1. brighter
2. hotter
3. dimmer
4. cooler
A small-mass star will last _____ a large-mass star.
1. longer than
2. for a shorter time than
3. just as long as
A red-shift in the spectrum of a star indicates that the star is
1. dying.
2. moving toward the Earth.
3. moving away from the Earth.
4. growing in size.
Where on this HR Diagram would you plot a star similar to our own sun?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a relatively small, hot star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a relatively large, hot star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a relatively large, cool star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a relatively small, cool star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a Red Giant star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a Blue Giant star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a White Dwarf star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
Where on this HR Diagram would you plot a Red Dwarf star?
1. Lower left.
2. Lower right.
3. Upper left.
4. Upper right.
5. Near the center.
What causes the dark bands observed in a solar spectrum?
1. the emission of specific elements
2. different chemical elements which absorb light at specific wavelengths
3. highly compressed, glowing gas
4. warmer gas in front of a source that emits a continuous spectrum
The apparent shift in a star's position caused by the motion of the observer is called
1. luminosity.
2. absolute magnitude.
3. apparent magnitude.
4. parallax.
Star A has an apparent magnitude of -1.5. Star B has an apparent magnitude of +3.5.
What is the difference in magnitude between the two stars?
1. 5 magnitudes
2. 4 magnitudes
3. 3.5 magnitudes
4. Impossible to tell
Star X has an apparent magnitude of 4.0. Star Y has an apparent magnitude of 1.0.
How much brighter is the brighter of these two stars compared to the dimmer of these two stars.
(Brightness Ratio = 2.5^Delta(m) ; Delta(m) is the difference in magnitude between the stars)
1. X is about 3 times brighter than Y
2. Y is about 3 times brighter than X
3. X is about 16 times brighter than Y
4. Y is about 16 times brighter than X
Star E shows a parallax angle (p) of 0.004 seconds of arc. How far away is star E from the Earth? Include units.
(Distance in parsecs = 1 / p ; Distance in light-years = 3.26 / p)
1. 250 parsecs
2. 4000 parsecs
3. 815 parsecs
4. 0.004 parsecs
A man is reading a magazine one foot from a 100 watt light bulb.
How many 100 watt light bulbs would be needed to receive the same amount of light from 3 feet away?
Brightness = 1 / (Distance)^2
1. 1 bulb
2. 3 bulbs
3. 9 bulbs
4. 100 bulbs
Which star appears the brightest?
1. Ultra
2. Vixon
3. Wabash
4. Xena
5. Yazoo
Which star would appear dimmest to the unaided eye?
(Hint: on a very dark night most people can just make out a 6th magnitude star.)
1. Ultra
2. Vixon
3. Wabash
4. Xena
5. Yazoo
Which star (or stars) would require binoculars or a telescope to see?
1. Ultra
2. Vixon
3. Wabash
4. Xena
5. Yazoo
The diagrams represent the spectrums of a star and of a stationary gas here on Earth.
How is the star moving with respect to the Earth?
1. The star is moving toward the Earth.
2. The star is moving away from the Earth.
3. The star is moving both ways.
4. The star is not moving.

Ch. 11b Stellar Distance and Motion

Review Questions