I will make an overview of the classical pulsating variable stars (i.e. SX Phoenicis, RR Lyrae, Anomalous Cepheids, Classical Cepheids) in our Local Group and...

Jurčák criterion states that umbra-penumbra boundaries are defined by a constant vertical magnetic field in stable sunspots. In this seminar I will talk about...

Understanding the atmospheric and evolutive properties of very low mass stars, brown dwarfs, and gas giant exoplanets have been important challenges for...

The Virtual Observatory (VO) is an international astronomical community-based initiative. It aims at providing easy and efficient access and analysis of the...

The Virtual Observatory is an international initiative on standardizing astronomical data and protocols, as well as the development of scientific tools...

Observational studies show that voids are prominent features of the large scale structure of the present day Universe. Even though their emerging from the...

Warps of disk galaxies are ubiquitous. In almost every disk galaxy a bending of the disk occurs where the stars fade away and hence where the dark matter halo...

Many images (and signals) admit sparse representations in the sense that they are well approximated by linear combinations of a small number of functions taken...

I will describe the major scientific motivation and outline design concept for a new 2 degree field, 1000 fibre multi-object spectroscopy facility for the WHT...