# Astronomy Chapter 17

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question
What is the absolute magnitude of our Sun?
+4.8
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The absolute magnitude of a star is its brightness as seen from a distance of:
ten parsecs.
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In comparing first magnitude Deneb with second magnitude Polaris, we find that:
Deneb appears 2.5 times brighter to use than does Polaris.
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At the distance of Jupiter (6 times further away from the Sun than Earth) the amount of sunlight received per square centimeter different by what factor?
36 times less
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Star A and star B both have an apparent magnitude of 4.0, but star A has an absolute magnitude of 1.0 and star B has an absolute magnitude of 7.0. Which statement below is correct? Select one: A. Star A appears brighter than star B, but actually star B and star A are the same brightness. B. Star B appears brighter than star A, but actually star B and star A are the same brightness. C. Star A and star B appear to have the same brightness, but actually star B is brighter than star A. D. Star A and star B appear to have the same brightness, but actually star A is brighter than star B. E. It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
D. Star A and star B appear to have the same brightness, but actually star A is brighter than star B.
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Star A and Star B both have an apparent magnitude of 7.0, but Star A is at a distance of 15 pc and Star B is at a distance of 30 pc. Which statement below is correct?
Star A and Star B appear to have the same brightness, but actually Star B is brighter than Star A.
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Star A and Star B both have an absolute magnitude of 2.0, but Star A is at a distance of 50 pc and Star B is at a distance of 20 pc. Which statement below is correct?
Star B appears brighter than Star A, but actually Star B and Star A are the same brightness.
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Star A and Star B both have an absolute magnitude of 2.0, but Star A has an apparent magnitude of 5.0 and Star B has an apparent magnitude of 7.0. Which statement below is correct?
Star A appears brighter than Star B, but actually Star B and Star A are the same brightness.
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Star A has an absolute magnitude of 2.5 and Star B has an apparent magnitude of 2.5, but Star A is a main sequence star and Star B is a red giant. Which statement below is correct?
It is impossible to determine how bright these stars are or appear to be relative to one another, given the information above.
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What are the two most important intrinsic properties used to classify stars?
luminosity and surface temperature
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The most famous G type star is:
the Sun.
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Star A is a main sequence star of spectral type F2 and Star B is a white dwarf of spectral type B4. Which statement below is correct?
Star B is hotter than Star A.
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Star A is a main sequence star of spectral type G5 and Star B is a red giant of spectral type K2. Which statement below is correct?
Star A is hotter than Star B.
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Stars that have masses similar to the Sun's, and sizes similar to the Earth are:
white dwarfs.
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On the H-R diagram, the Sun lies:
above the middle of the main sequence.
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Which of the following is the most common type of star?
low mass main sequence
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The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.
luminosity or absolute magnitude
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How might the most common occurring stars be described, based on our stellar neighborhood?
M main sequence
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On the H-R diagram, red supergiants like Betelguese lie:
at the top right.
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On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:
at the lower left.
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In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:
top left.
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In what range of masses are most stars found?
.1 to 100 solar masses
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What is the single most important characteristic in determining the course of a star's evolution?
mass
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Which of the following best describes the size and distance relationship of our Sun and the nearest star?
two marbles separated by 300 kilometers
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What is the typical main sequence lifetime of an M-type star?