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Jan 29, 2015 · A variable star is, quite simply, a star that changes brightness. A star is considered variable if its apparent magnitude (brightness) is altered in any way from our perspective on Earth....
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes systematically with time. 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: [ 1 ]
Jan 15, 2023 · Bottom line: A variable star is one whose brightness changes regularly. Here we discuss the different kinds of variable stars and what causes their brightness variations.
A Cepheid variable (/ ˈsɛfi.ɪd, ˈsiːfi -/) is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness, with a well-defined stable period and amplitude. Cepheids are important cosmic benchmarks for scaling galactic and extragalactic distances.
A variable star is simply one whose brightness (or other physical property such as radius or spectral type) changes over time. At a fundamental level all stars are variable as they evolve and change over time (from a main sequence to a red giant star as in the Sun's case for example).
Variable star, any star whose observed light varies notably in intensity. The changes in brightness may be periodic, semiregular, or completely irregular. A brief treatment of variable stars follows. For full treatment, see star: Variable stars.
Dec 16, 2017 · Tonight, we zoom in on a variable star – a star whose brightness changes – near the bright star Vega in the small but distinctive constellation Lyra the Harp. Here’s how to locate it. A dark sky...
