The radiation of light from matter rotating in the vicinitiy of compact objects (neutron stars or black holes) is expected to be affected from significant frecuency shifts which are two-fold in origin: (1) the velocity of rotation, in the inner parts of accretion disks, is of the order of the velocity of light, thereby producing Doppler shifts of

The shorter contributed papers are published in Astrophysics and Space Science, Vol. 156, Nos. 1 -2 (Jun 1989), Vol. 157, Nos. 1 - 2 (Jul 1989). Contents: 1. Preface. 2. Origin and early development of galaxies. 3. Gas and global star formation. 4. Galactic nuclei. 5. Population, age and dynamics of our Galaxy. 6. Supernovae and their effects. 7

Topics discussed include the origin and early development of galaxies; gas and global star formation; galactic nuclei; population, age, and dynamics of the Galaxy; supernovae and their effects; chemical evolution; population synthesis; and galaxy interactions. Papers are presented on dwarf galaxies, the role of magnetic fields in the evolution of

This paper presents examples of star-forming phenomena in the discs of spirals which show symptoms of phase-coherence over kpc scales. Cases are found where, along an arm, the youngest blue stars are coherently displaced from a recent but older generation of redder evolved supergiants; in other cases, the star formation efficiency in arms appears

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The dynamics of the merger between a high- and a low-luminosity elliptical galaxy has been studied to understand how kinematically peculiar cores in elliptical galaxies might form. Numerical simulations of mergers provide rotation curves, surface density profiles, surface density contour plots and velocity maps of the merger remnants, as well as