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Although pulsations of $\delta$ Scuti type are not expected among Ap starsfrom a theoretical point of view, previous observations of the known $\delta$Scuti star HD21190 indicated a spectral classification F2 III SrEuSi:, makingit the most evolved Ap star known. Our atmospheric chemical analysis based onrecent HARPS observations confirms the presence of chemical peculiarities inHD21190. This star is also the only target known to host a magnetic field alongwith its $\delta$ Scuti pulsation properties. Using an astrometric analysis, weshow that HD21190 forms a physical binary system with the companion CPD-83$^{\circ}$ 64B. The presented astrometric and spectroscopic study of thebinary components is important to understand the complex interplay betweenstellar pulsations, magnetic fields, and chemical composition.

An astrometric and spectroscopic study of the $\delta$ Scuti variable HD21190 and its wide companion CPD -83$^{\circ}$ 64B