A magnetic study of the $\delta$ Scuti variable HD 21190 and the close solar-type background star CPD -83${}^{\circ }$ 64B

S. P. Järvinen, S. Hubrig, R. -D. Scholz +3

HD 21190 is a known $\delta$ Scuti star showing Ap star characteristics and a variability period of 3.6 h discovered by the Hipparcos mission. Using Gaia DR1 data for an astrometric ana…