ar X iv : a st ro - p h / 99 05 28 9 v 1 2 1 M ay 1 99 9 A Model for the Scattered Light Contribution and Polarization of the Diffuse H α Galactic Background

ar X iv : a st ro - p h / 99 05 15 0 v 1 1 2 M ay 1 99 9 When SN explode in a starburst : trasitions among AGN types

Among the Active Galactic Nuclei (AGN) that have suffered type mutations, the classically classified Seyfert 2 NGC 7582 recently found at a Seyfert 1 stage, is perhaps one of the most puzzling cases, since it defies a well supported case for unification. We investigate the possibility that this type transition, common to other 12 AGN, is driven by supernovae (SN) exploding in a nuclear/circumnu...

ar X iv : a st ro - p h / 99 05 37 6 v 1 2 8 M ay 1 99 9 A 6 . 4 - hr positive superhump period in TV

ar X iv : a st ro - p h / 99 05 03 1 v 1 5 M ay 1 99 9 Gas Dynamics in the Luminous Merger NGC 6240

We report 0. ′′ 5 × 0. ′′ 9 resolution, interferometric observations of the 1.3 mm CO J=2→1 line in the infrared luminous galactic merger NGC 6240 2. About half of the CO flux is concentrated in a rotating but highly turbulent, thick disk structure centered between the two radio and near-infrared nuclei. A number of gas features connect this ∼500 pc diameter central disk to larger scales.

ar X iv : a st ro - p h / 94 05 04 9 v 1 2 4 M ay 1 99 3 COMPLETE NORMALITY CONDITIONS FOR THE DYNAMICAL SYSTEMS ON RIEMANNIAN MANIFOLDS

New additional equations for the Newtonian dynamical systems on Riemannian manifolds are found. They supplement the previously found weak normality conditions up to the complete normality conditions for Newtonian dynamical systems.

ar X iv : a st ro - p h / 99 05 37 8 v 1 2 8 M ay 1 99 9 New evolutionary scenarios for short orbital period CVs

We suggest new evolutionary scenarios for non-magnetic short orbital period CVs. The first model is the analogy of the 'hibernation scenario' or the 'modern hibernation scenario'. The second one is an extension of Mukai & Naylor (1995) ideas. All models imply a tight connection between permanent superhump systems and classical novae. We highlight the significance of the observed evolution of V1...