Advection-dominated Accretion in the Galactic Center and the Appearance   of Sgr A*
  We present a modified description of advection-dominated accretion flows (ADAF) with a geometrical viscosity. A simplified treatment of the dynamics of the flow in the inner relativistic part is suggested and results are compared with the galactic center source Sgr A*. 
T. Beckert(1) and W. J. Duschl(1,2) ((1) ITA, Universitaet Heidelberg,   Germany, (2) MPIfR Bonn, Germany)