Blazhko effect A secondary variation of the amplitude and period of some RR Lyrae stars and related pulsating variables, named for its discoverer, the Russian astronomer Sergei Blazko (1870-1956). The effect is displayed, for example, by the RR Lyrae star XZ Cygni, which has a primary pulsation period of about 0.466 days but displays a further modulation with a 57-day cycle. Although the Blazhko effect is not properly understood, it is thought to involve double-mode pulsation or, in some cases, an oblique rotator. Related category STELLAR ASTROPHYSICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |