Using numerical simulations of the merger between a high- and a low-luminosity elliptical galaxy the authors show that this type of merger can result in an elliptical with a counterrotating core. Only merger orbits retrograde with respect to the primary spin generate counterrotating cores, because the initial secondary spin does not survive the

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The authors parameterize the photometric distortion waves in the short-period RS CVn system BH Vir by a dark, circular spot model for the active regions on the primary stars. From recent observations and archival source, they infer the positions and areas of the active regions and also evaluate the temperatures of the spotted regions relative to

Using the measured common distance from the observer, angular separation of a dwarf satellite from its mother galaxy and their relative radial velocities, plus three criticable assumptions: circularity of the orbit, spherical symmetry of the gravitational potential, and that the radius of the dwarf galaxy is limited by tidal interaction with the

The authors present some general results suggesting that ongoing strong interaction or merging between elliptical galaxies produces a well defined type of radio jet galaxies.