We present high resolution long-slit spectra of HH 444 and numerical simulations for this Herbig-Haro object. From the comparison between observations and simulations we are able to study the physical scenario of this jet.

A light curve of the eclipsing binary CM Draconis has been analyzed for the presence of transits of planets of size >=2.5 Earth radii (RE), with periods of 60 days or less, and in coplanar orbits around the binary system. About 400 million model light curves, representing transits from planets with periods ranging from 7 to 60 days, have been

We apply non-extensive methods to the statistical analysis of fully developed turbulent flows. Probability density functions of velocity differences at distance r obtained by extremizing the Tsallis entropies coincide well with what is measured in turbulence experiments. We derive a set of relations between the hyperflatness factors F_m and the non

In this contribution we discuss new results of a program aimed at studying the physical properties, origin and evolution of ``low-ionization, small-scale structures in PNe''. Within this project we classify and discuss the properties of a sample of more than 50 PNe, collected from the literature, in the light of their possible formation mechanisms

We describe a new LTE inversion code for the analysis of Stokes profiles emerging from unresolved magnetic elements. It has been specifically designed to obtain the thermal, dynamic, and magnetic properties of these structures in a self-consistent manner by fitting the whole shape of the observed spectra. The inversion code is based on a previous

Let $X$ be a compact Kahler manifold, and let $L$ be a line bundle on $X.$ Define $I_k(L)$ to be the kernel of the multiplication map $ Sym^k H^0 (L) o H^0 (L^k).$ For all $h leq k,$ we define a map $ ho : I_k(L) o Hom (H^{p,q} (L^{-h}), H^{p+1,q-1} (L^{k-h})).$ When $L = K_X$ is the canonical bundle, the map $ ho$ computes a second fundamental