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16 Cards in this Set
- Front
- Back
star
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body of gases that gives off a tremendous amount of radiant energy in the form of light and heat
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spectrometer
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a device that separates light into a different color, or wavelengths
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circumpolar
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describing any star that is always visible in the night sky and, from the Northern Hemisphere, can be seen circling Polaris.
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doppler effect
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apparent shift in the wavelength of energy, such as sound wave or light wave, emitted by a source moving away from or toward an observer
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blue shift
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the colors in the spectrum of a star moving toward earth
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red shift
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apparent lengthening of the light waves emitted by a star moving away from the earth
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light-years
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distance that light travels in one year, about 9.5 trillion km
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parallax
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method of determining the distance from the earth to a star based on the shift in the apparent position of the star when viewed from different angles
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Cepheid variable
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a star that brightens and fades in a regular pattern
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apparent magnitude
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brightness of a star as it appears from the earth
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absolute magnitude
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brightness of a star as it would appear if located 32.6 light-years from the earth
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H-R diagram
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Hertzsprung-Russell diagram' graph showing the relationship of the surface temperature and absolute magnitude of a star
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main-sequence stars
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star with characteristics that place it within a band running through the middle of the H-R diagram
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giants
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very large, cool, bright star
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super giants
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extremely large,, giant star
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white dwarfs
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small, hot, dim star
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