A star that perceptibly changes its illumination. See "Cepheid variable".
a star that varies noticeably in brightness
a star that actually changes in brightness
a star where the brightness of the star changes over time (usually a small amount)
A variable star is simply one whose brightness (or other physical property such as radius or spectral type) changes over time. Intrinsic variables are those in which the change in brightness is due to some change within the star itself such as in pulsating stars like the Cepheids. Extrinsic variables are those in which the light output changes due to some process external to the star itself. The most common example of these are the eclipsing binaries.
A star whose apparent brightness changes over time
A star whose magnitude changes over time. Cepheid variable stars are considered standard candles, objects which can be used to estimate distances in the universe.
A star which has variable luminosity.
A star whose light changes over time. Stars can vary in brightness for a variety of reasons including their eclipse by a companion star or an instability in their interior that causes the star to swell and shrink.
A star that varies in brightness. There are many types, some stars can change in brightness in a matter of minutes whereas others change slowly over many months. The first 334 variable stars discovered in a constellation are given a one or two letter code such as R Scuti or UV Ceti. Other variable stars are designated V335, V336, etc. Proxima Centauri for example is known to variable star astronomers as V645 Centauri.
A star whose luminosity changes with time. [More Info
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. White Dwarf. A whitish star, of up to 1.4 Solar masses, and about the size of the Earth with consequential very high density, characterised by a high surface temperature and low brightness.
A star that fluctuates in brightness. These include eclipsing binaries.
A star that varies in luminosity.
A star whose luminosity changes with time, some quite erratically, others more regularly.
A variable star is one whose brightness changes regularly. They can have periods ranging from minutes to years. The apparent changes in brightness are caused by different phenomena; some change in size, some eject material, and others are in pairs that periodically obscure and enhance each other.
A star whose luminosity (brightness) changes with time.
