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Coronae Borealis : a combined interpretatio n of th e magneti c quantitie s obtaine d throug h th e momen t technique , and of th e observations of broadban d linear polarisation
S . Bagnulo , M . Landolfi , G . Mathys , M . Land i Degl'Innocenti
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Institut fur Astronomie, Universitat Wien Turkenschanzstrasse 17, A-1180 Wien, Austria; e-mail: bagnulo@astro.univie.ac.at Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 1-50125 Firenze, Italy; e-mail: landolfi@arcetri.astro.it European Southern Observatory, Casilla 19001, Santiago 19, Chile; e-mail: gmathys@eso.org C.N.R., Gruppo Nazionale di Astronomia, Unita di Ricerca di Arcetri, Largo E. Fermi 5, 1-50125 Firenze, Italy; e-mail: mlandi@arcetri.astro.it

Abstract . W e presen t a mode l for th th e mea n longitudina l field , crossover , linea r polarisation . W e fin d tha t CrB whic h ma y no t b e fully accounte d for

e well-know n C P sta r Cr B consisten t wit h observation s o f mea n quadrati c field , mea n fiel d modulus , an d broadban d , lik e mos t C P stars , exhibit s a comple x magneti c structure , eve n b y a second-orde r multipola r expansion .