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22 Cards in this Set
- Front
- Back
what is the apparent shift in a stars position due to the orbital motion of earth?
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stellar parallax
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what is stellar parallax used for?
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measuring the distance of a star
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what is the measurment that is often used?
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light years
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how long is one light year?
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9.5 trillion km or 5.8 trillion miles
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what three factors is stellar brightness controlled by?
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tempature, size, distance
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what is the measurment of stars brightness?
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magnitude
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what is the brightness when a star is viewed from earth?
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apparent magnitude
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what is a true brightness of a star?
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absolute magnitude
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are negetive numbers used in magnitude?
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yes
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what is the brightness of a standard distance absolute magnitude star?
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32.6 light years
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what are most stars absolute magnitude?
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-5 to 15
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what is the color of stars with tempatures between 5,000 and 6,000 k?
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yellow
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what is the star that emits longer wavelength energy so they appear this color?
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red
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what are stars that obit each other?
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binary system
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what is the apparent color of very hot stars?
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blue
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what is the manifistation of a stars surface temp.?
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color
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what is the brightness or luminosity of a star?
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magnitude
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what are the parts of the H-R diagram in order from least to greatest?
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white dwarfs, red giants, and main sequence stars.
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what is clouds of dust and gases that contains the material that forms stars and planets?
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nebula
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what glows if it is close to a very hot star?
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bright nebula
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what are 2 kinds of the bright nebula?
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emmision, and reflection nebula
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what is not close to any bright star that appears opaque?
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dark nebula
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