The photospheric Mn I 539.4 nm line in the solar spectrum shows unusual variability with the solar cycle in that its depth decreases with increasing activity...

Ignacio Ferreras, Francesco La Barbera and Alexandre Vazdekis take a close look at one of the key ingredients in modelling star formation.

We describe a set of Hα emission line profiles from populations of H II regions in nearby spiral galaxies. These are characterized by a strong Gaussian central...

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Recent results suggest that there is a group of trans-Neptunian objects (TNOs), 2003 EL61 being the biggest member, with similar dynamical and physical...

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We introduce a pixel-to-pixel comparison method to detect the temperature anisotropies on the Cosmic Microwave Background induced by the time variation of...

We performed an uniform spectroscopic analysis of 1111 FGK dwarfs observed as part of the HARPS GTO planet search program. We applied a purely chemical approach...

The turbulent convection zone is now considered as the only known source of the excitation of p-modes in the Sun. In Perez and Roca Cortes (1999) an analysis...