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10 Cards in this Set
- Front
- Back
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What are the seven properties of a star?
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1. distance
2. temperature 3. luminosity 4. composition 5. radius 6. mass 7. radial velocity |
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What is distance to a star measured in?
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Lightyears or parsecs
Calculated by parallax or standard candle method |
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What is temperature of a star measured in?
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Degrees Kelvin
Calculated by measuring the intensity of its EM radiation @ different wavelengths |
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What is the radius of a star?
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The size of the star
Found by comparing luminosities |
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What is the mass of a star?
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Measures the amt. of material in a star and its gravitational potential
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What is the luminosity of a star?
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Total amt. of EM radiation that the star gives off
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What is the magnitude of a star?
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How bright a star appears to us on Earth
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What is the absolute magnitude of a star?
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How bright a star should be if it was at standard distance
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What is the composititon of a star?
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- What they are made of
- Found by studying emission spectra - Mostly hydrogen and helium - Exact amt. establishes "age" of star |
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What is radial velocity?
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Radial velocity is how fast a star is moving toward or away from us
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