Aims:We study the structure of the magnetic field vector in the internetwork and search for the presence of small-scale loops. Methods: We invert 1.56 μm spectropolarimetric observations of internetwork regions at disc centre by applying the SIR code. This allows us to recover the atmospheric parameters that play a role in the formation of these

Aims:We report the discovery of a new white dwarf/M dwarf binary, HS 1857+5144, identified in the Hamburg Quasar Survey (HQS). Methods: Time-resolved optical spectroscopy and photometry were carried out to determine the properties of this new cataclysmic variable progenitor (pre-CV). Results: The light curves of HS 1857+5144 display a sinusoidal

The CoRoT space mission, scheduled for launch in December 2006, has two primary science goals: asteroseismology and the detection of planetary transits, the latter being the subject of this contribution. Given its expected photometric performance and its 150 day observing window, CoRoT will detect planets with periods up to 75 days and radii down

Investigaciones llevadas a cabo en los últimos 25 años sugieren que la vasta estructura que se observa en el Universo proviene de pequeñísimas fluctuaciones generadas en los primeros instantes del Universo. Gracias al enorme progreso que se ha realizado en los últimos tiempos, se ha podido establecer con gran precisión el valor de los parámetros

Because of an error in transferring proof corrections, two instances of νl have been incorrectly set as νlow. 1. In § 5.2, paragraph 4 (bottom of p. 602), the second sentence should read (corrected passage underlined): ``Shifts in these frequency-frequency correlations were found in two AMPs by van Straaten et al. (2005) and Linares et al. (2005)