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The observations of L 110, 112 and 113 were obtained with the Danish Faint Object Spectrograph and Camera (DFOSC) on the 1.54-m Danish telescope at the European Southern Observatory (ESO) on La Silla, on 1999 Nov 5, 1999 Nov 4 and 1999 Dec 29, respectively. (3 data files).

We have discovered small whirlpools in the Sun, with a size similar to terrestrial hurricanes (

Aims: Using new Chandra X-ray observations and existing XMM-Newton X-ray and Hubble far ultraviolet observations, we aim to detect and identify the faint X-ray sources belonging to the Galactic globular cluster NGC 2808 in order to understand their role in the evolution of globular clusters. Methods: We present a Chandra X-ray observation of the

Context: The connection of cluster mergers with the presence of extended, diffuse radio sources in galaxy clusters is still debated. An interesting case is the rich, merging cluster Abell 520, containing a radio halo. A recent gravitational analysis has shown in this cluster the presence of a massive dark core suggested to be a possible problem for

Context: The young σ Orionis cluster is an important location for studying the formation and evolution of stars, brown dwarfs, and planetary-mass objects. Its metallicity, although it is a fundamental parameter, has not been well determined yet. Aims: We present the first determination of the metallicity of nine young late-type stars in σ Orionis