We carry out a statistical analysis of galaxy pairs selected from chemical hydrodynamical simulations with the aim at assessing the capability of hierarchical...

How the stellar mass of early-type galaxies is assembled remains an open question. Are the stars formed in situ, possibly triggered by merger events, or do they...

The Deep Impact mission was designed to have much of the mission-critial science done from Earth-based telescopes An unprecedent worldwide coordinated campaign...

The authors present the first results on the optical identification of 89 ROSAT sources on the second Lockman hole. Because of the low Galactic H I column...

Narrow band near infrared images of comet 1995 O1 (Hale-Bopp), where obtained in day-time, during April 1997, using the 1.52m Carlos Sanchez Telescope, at Teide...

A combination of inverse and forward analysis techniques has been applied to p-modes rotational splittings in order to infer the solar rotation rate in the...

We present inferences of the internal solar rotation rate and its evolution during solar cycle 23. A full solar cycle of MDI observations have been analyzed...

We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star...

The highlights of the round table discussion held to discuss the most important pending problems in cometary astrophysics are reported. A number of experts...