10 – Flashcard
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How does the parallax of a nearby object compare to that of an object farther away?
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The nearby object exhibits a larger parallax than the farther object.
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Why would astronomers measure the parallax angle of a planet or star? What physical property of that object are they trying determine?
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It's distance.
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A parsec is about 3.3 light years.
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True.
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Which if the following is not intrinsic property of a star?
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Distance.
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Suppose two stars with the same luminosity are at different distances from earth. Which has the greater apparent brightness.
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The closer start.
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When looking at the brightest stars in the night sky, what intrinsic property can we estimate with the unaided eye?
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Temperature - red stars are cooler than blue ones.
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A +6.0 magnitude star is brighter than a +3.0 magnitude star.
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False
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What important property of a star do we learn from its spectral class?
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Temperature.
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Which of the following methods is useful for determining a star's approximate surface temperature.
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Measuring its apparent brightness through two or more colors filters and comparing these values.
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Which of the following would NOT be useful in constructing a Hertzeprung-Russel (H-R) diagram.
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Measuring the star's size.
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Why are the most common stars among the most difficult to observe?
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They have low luminosites.
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An H-R diagram is a plot of which of two stellar properties?
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Luminosity and temperature.
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What property of stars can be measured only by using binary star systems?
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Mass
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Main sequence stars lie at the top right corner of the H-R diagram?
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False.
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The mass of a newly formed start will determine its position on the main sequence.
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True.
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The sun at absolute magnitude +4.8 would be one of the brightest stars in the sky if seen from 32 light years distance.
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False.
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A type B9 star is hotter than a type A0.
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True.
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A type B star is bluer than a type G star.
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True
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The vast majority of stars near us would fall to the bottom right on the H-R.
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True
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What physical property of a star does the spectral type measure?
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Temperature
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The doppler shift is used to find
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Spectroscopic binaries.
