Blazhko Effect
Encyclopedia
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.
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.
RR Lyrae variable
RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and often used as standard candles to measure galactic distances.This type of variable is named after the prototype, the variable star RR Lyrae in the constellation Lyra....
type variable stars. It was first observed by Sergey Blazhko in 1907 in the star RW Dra.
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
Nonlinear resonance
In physics, nonlinear resonance is the occurrence of resonance in a nonlinear system. In nonlinear resonance the system behaviour – resonance frequencies and modes – depends on the amplitude of the oscillations, while for linear systems this is independent of amplitude.-Description:Generically two...
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.