The huge improvement in sensitivity provided by the Infrared Space Observatory (ISO) offered the opportunity to probe the galaxy population to higher redshift than the Infrared Astronomical Satellite (IRAS) and to make progress in understanding the obscured star-formation history (SFH) of the Universe. The ``European Large Area ISO Survey'' (ELAIS)

We have obtained spectra for 103 published globular cluster candidates in the Sculptor group galaxies NGC 253 and 55. On the basis of radial velocities and digitized plate images, 14 globular clusters are identified in NGC 253 and one probable globular cluster is identified in NGC 55. The majority of the objects in the sample appear to be

This paper presents a new diagnostic tool for the inference of the thermal, dynamic, and magnetic properties of the solar chromosphere. It consists of a non-LTE inversion code of Stokes profiles induced by the Zeeman effect in magnetized stellar atmospheres. This code is the generalization, to the non-LTE Stokes transfer case, of the inversion code

In this paper we deal with the problem of the generation of internal waves at the bottom of convective zone in solar-type stars, and with the transport process linked to the non-adiabatic propagation of these waves through the stable radiative region. The main improvement with respect to the previous papers in this series comes from the convection

We show that a wide variety of processes lead, in certain limit, to a simple generalization of the negative binomial distribution. Its properties are studied in detail and used to derive an important result in the theory of avalanches.

We present observations and analyses of seven Galactic O stars of type O6 and earlier. The analyses are carried out using NLTE plane-parallel, hydrostatic models as well as NLTE spherical models with mass-loss. With detailed calculations for the former and simulations for the latter, it is shown that the flux blocking due to UV metal lines is