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We report the results of spectropolarimetric study of the classical Cepheid$\eta$ Aql. We found that the longitudinal magnetic field of $\eta$ Aqlsinusoidally varies with the radial pulsation period, while the amplitude $B$,mean field $B_0$, and phases of maximum and minimum field change from year toyear. We hypothesize that possible reasons of those variations are stellaraxial rotation or dynamo mechanisms.

Spectropolarimetric study of the classical Cepheid $\eta$ Aql: pulsation and magnetic field