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Definition
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Term
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Definition
| Measure of the star's velocity perpendicular to our line of sight |
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Definition
| the rate at which energy from the star reaches a detector |
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Definition
| system of ranking stars by apparent brightness |
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Definition
| measure of apparent brightness |
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Definition
| the apparent magnitude it would have if places at a standard distance of 10 pc from the viewer |
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Term
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Definition
| the measurement of the amount of starlight received through each member of a set of filters |
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Definition
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Definition
| Stars comparable in size to, or smaller than, the Sun are called |
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Term
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Definition
| Stars up to 100 times larger than the Sun |
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Term
| Stars more than 100 times larger than the Sun are called |
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Definition
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Term
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Definition
| large, cool, and luminous |
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Definition
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Definition
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Definition
| general diminution of starlight by dust |
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Definition
| general term for any fuzzy bright or dark patch in the sky |
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Term
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Definition
| extended clouds of hot, glowing interstellar gas |
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Term
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Definition
| irregularly shaped regions in the interstellar medium whose constituent dust diminishes or obscures light from background stars |
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Definition
| warm, very luminous object that emits mainly infrared radiation |
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Definition
| the region in the H-R diagram where stars lie when the formation process is over |
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Definition
| fragments of collapsing gas and dust that did not contain enough mass to initiate core nuclear fusion |
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Term
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Definition
| young hot stars ionize the surrounding gas, forming emission nebulae |
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Term
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Definition
| stably fusing hydrogen into helium at their centers |
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Term
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Definition
| the nonburning helium at the center is surrounded by a layer of burning hydrogen |
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Term
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Definition
| The white dwarf cools and fades |
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Term
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Definition
| the region of space within which matter belongs to the star |
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Term
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Definition
| gas flows from the giant onto its companion |
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