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DIVISION V: VARIABLE STARS

Division V on Variable Stars consists of Commission 27, also called Variable Stars, and Commission 42, Close Binary Stars. The former deals with stars whose variations are intrinsic, whereas in the latter the variations are caused by the interactions between the components in the binary or multiple star system. There may be cases where the assignment of an object to one of the two Commissions may be in doubt. For example, the observation of pulsating stars in eclipsing binaries within nearby galaxies, or the relation between some types of oscillation modes and membership to binary systems, continue to be widely discussed.