1) Tor Books book
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https://www.crosswordclues.com/clue/variable-star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: Many, possibly most, stars have at least some variation in luminosity: the energy output of our Sun, for ...
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http://en.wikipedia.org/wiki/Variable_star
Star with varying luminosity.
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http://planetfacts.org/space-terms/
any star whose observed light varies notably in intensity. The changes in brightness may be periodic, semiregular, or completely irregular.[2 related articles]
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http://www.britannica.com/eb/a-z/v/8
A star that changes in brightness. Variable stars fall into two general categories: intrinsic variables, in which physical changes, such as pulsations or eruptions, are involved, and extrinsic variables, in which the light output fluctuates due to eclipses or stellar rotation. Further classification...
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http://www.daviddarling.info/encyclopedia/V/variablestar.html
Any star whose brightness or magnitude varies with time. The variations can be intrinsic because of internal processes or extrinsic, due to eclipses, dust and other phenomena. Variations can also be irregular or periodic.
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http://www.encyclo.co.uk/visitor-contributions.php
A star that fluctuates in brightness. These include eclipsing binaries.
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http://www.seasky.org/astronomy/astronomy-glossary.html
A star whose brightness changes over the course of days, weeks, months, or years.
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http://www.skyandtelescope.com/astronomy-terms/
[
n] - a star that varies noticeably in brightness
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http://www.webdictionary.co.uk/definition.php?query=variable%20star
noun a star that varies noticeably in brightness
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https://www.encyclo.co.uk/local/20974
Star whose brightness changes, either regularly or irregularly, over a period ranging from a few hours to months or years. The Cepheid variables regularly expand and contract in size every few days or weeks. Stars that change in size and brightness at less precise intervals include long-period variables, such as the red giant Mira in the conste...
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https://www.encyclo.co.uk/local/21221
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