Noun
English Wikipedia has an article on:variable starWikipedia
variable star (plural variable stars)
(astronomy) Any star whose brightness varies.
Beta Gruis is a red giant variable star with a minimum magnitude of 2.3 and a maximum magnitude of 2.0. Source: Internet
Joel Stebbins at the University of Illinois Observatory used an early selenium cell photometer to produce the first-ever photoelectric study of a variable star. Source: Internet
For example, at the Harvard Observatory Henrietta Swan Leavitt discovered the cepheid variable star period-luminosity relation which she further developed into a method of measuring distance outside of our solar system. Source: Internet
It belongs to the UX Ursae Majoris subgroup of cataclysmic variable star systems, where material from the donor star is drawn to the white dwarf where it forms an accretion disc that remains bright and outshines the two component stars. Source: Internet
It has since become a variable star fluctuating between 2.0 and 1.6. Source: Internet
It is a slow irregular variable star with the quoted magnitude of +0.96. Source: Internet