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The Blazhko effect, which is sometimes called long-period modulation, is a variation in period and amplitude in RR Lyrae type variable stars. It was first observed by Sergey Blazhko in 1907 in the star RW Dra.[1] The cause of this effect is currently a matter of debate, with there being two primary hypotheses. The first, referred to as the resonance model, predicts that the cause of modulation is non-linear resonance in the star interior. The second, known as the magnetic model, assumes the variation to be caused by the magnetic field being inclined to the rotational axis, deforming the main radial mode.[2]
References
- ^ Horace A. Smith (2004). RR Lyrae Stars. Cambridge University Press. p. 103. ISBN 0521548179. http://books.google.com/books?id=dMv_r82moCQC&pg=PA104&dq=Blazhko+effect&ei=n2Z6St21HJOilQTns4WxDQ#v=onepage&q=Blazhko%20effect&f=false.
- ^ Katrien Kolenberg (2008). "Explanations for the Blazhko effect in RR Lyrae stars". The Blazhko Project. http://www.univie.ac.at/tops/blazhko/Background.html. Retrieved 2008-12-17.
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