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In this paper we present the main results of an extensive comparison carried out between the most modern theoretical models of stellar structure, including moderate core over- shooting and mass loss, and the best available data of apsidal motion rates for double-lined eclipsing binaries. Though stellar absolute dimensions (radii, temperatures, etc)

We present H I 21 cm observations of the grand design spiral galaxy NGC 4321, as obtained with the VLA. From our original data, we have obtained data cubes with resolutions ranging from 13" to 45". The H I is observed to break up into small condensations at high resolution. These condensations, with typical masses of 3.3±0.7 × 107 Msun, are not

An infrared liquid nitrogen (LN2) cooled focal reducer camera has been designed to be used at the 1.5 m (f/13.8) Carlos Sanchez IR Telescope (CST) at the Observatorio del Teide. The image quality is better than 30 micrometers (typical pixel size of the detector) with an image scale of 0.5 arcsec/pixel. The final design is a very compact system

We present a new method based on artificial neural networks trained with multiseed backpropagation, for displaying an n-dimensional distribution in a projected space of one, two, or three dimensions. As principal component analysis (PCA) the proposed method is useful for extracting information on the structure of the data set, but unlike the PCA

ISOPHOT is one of four instruments onboard the ESA Infrared Space Observatory scheduled for launch in September 1995. It covers the wavelength range 2.5 micrometers to 240 micrometers with wide and marrow spectral bands. Diffraction limited observations as well as wide beam measurements of faint extended sources are possible. Polarimetric