EL NUCLEO SOLAR, DONDE SE GENERA LA ENERGIA, ES LA REGION MAS DESCONOCIDA DEL SOL. LOS MODOS PROPIOS DE OSCILACION DE ORIGEN GRAVITATORIO (MODOS-G), ES LA TECNICA POTENCIALMENTE MAS ADECUADA PARA ESTUDIAR ESTA ZONA DEL SOL. SIN EMBARGO, DEBIDO A LA BAJA AMPLITUD DE ESTOS MODOS Y AL NIVEL DE RUIDO TANTO SOLAR COMO ATMOSFERICO, HA SIDO IMPOSIBLE SU

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We present a new method based on artificial neural networks techniques aimed at determining the fraction of binary systems populating star clusters. We address the problem from a statistical point of view, avoiding the important biases induced by individual binary identification. The idea is to evaluate the percentage of binaries by comparing the

We have found that the bulge of the large, nearby Sb galaxy NGC 7331 rotates retrograde to its disk. Analysis of spectra in the region of the near-IR Ca II triplet along the major axis shows that, in the radial range between 5" and ~20", the line-of-sight velocity distribution of the absorption lines has two distinct peaks and can be decomposed

Based on photometry of deep CCD frames of the central region of the OB cluster Berkeley 86, we derive the cluster mass function. The absence of current star formation, and the cluster's young age of about 6Myrs, leads to the conclusion that the initial mass function (IMF) and the current mass function are identical for stars with m

Combining an electronic theory with molecular dynamics simulations we present results for the ultrafast structural changes in small clusters. We determine the time scale for the change from the linear to a triangular structure after the photodetachment process Ag$_3^- ightarrow { m Ag}_3$. We show that the time-dependent change of the ionization