Magnetic field and radial velocity of the CP2 star alpha(2) CVn

We analyse spectra of the well-known bright CP2 star alpha(2) CVn in order to test the suitability of a new equipment for magnetic field observations and a computer program for the calculation of magnetic surface maps. The variation of the longitudinal magnetic field, derived from the elements H and Si Il, which are distributed probably homogeneously on the stellar s urface, can be represented by the superposition of a dipole with a quadrupo le using the model of the oblique rotator. The corresponding magnetic field structure on the stellar surface is compared with the distributions of the chemical elements Ti, Cr, and Fe determined by several authors. A series of CCD coude spectra as well as some selected observational sets, obtained by other authors in the last decades, were used for the search for periods in radial velocities. The accuracy of the period derived for a sin gle data set does not allow us to draw a conclusion on the existence of a p hase shift between the data sets.