Confirmation of the magnetic nature of the delta Scuti star HD 21190

Abstract

HD 21190 is a known delta Scuti star showing Ap star characteristics and a variability period of 3.6h discovered by the Hipparcos mission. Our previous spectropolarimetric observations with FORS1 at the VLT showed the presence of a rather weak magnetic field of the order of a few tens of Gauss. New spectropolarimetric measurements with FORS2 at the VLT reveal that the magnetic field in this star is much stronger, about -250G, indicating that also Ap stars can pulsate in the delta Scuti range.