FLUFFY DUST AGGREGATES IN THE VICINITIES OF HERBIG AE STARS ??

                           N.A. Krivova
        MPI fuer Aeronomie, Katlenburg-Lindau, Germany and
        Astronomical Institute of St.Petersburg University,
                       St.Petersburg, Russia

                            H. Kimura
        MPI fuer Aeronomie, Katlenburg-Lindau, Germany and

                               and

                            V.B. Il'in
        Astronomical Institute of St.Petersburg University,
                       St.Petersburg, Russia



                            ABSTRACT

Monte Carlo simulations of polarized radiation transfer in the dust
shells of HAeBe stars are used to model various manifistations of
dust including those specific to UXORs. In contrast to previous
works, a more adequate technique (DDA) is utilized to describe the
optical properties of the CS dust aggregates. The emphasis is made
on the effects of the fluffiness of grains. Whereas moderately
porous particles give, generally, a better agreement with the
observations than compact grains, highly porous aggregates
contradict to most of the data.

The work was partly supported by INTAS (grant 99/652).