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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
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