We present the first science results from the High Optical Resolution Spectrograph (HORuS), a cross-dispersed echelle spectrograph now in operation on the 10.4-m Gran Telescopio Canarias (GTC). The spectrograph provides a FWHM resolving power of 25,000 and coverage between 370 and 690 nm. HORuS has been mostly built with parts from a previous

We report evidence from APOGEE for the presence of a new metal-poor stellar structure located within ∼4 kpc of the Galactic Centre. Characterized by a chemical composition resembling those of low-mass satellites of the Milky Way, this new inner Galaxy structure (IGS) seems to be chemically and dynamically detached from more metal-rich populations

Context. ESPRESSO is the new high-resolution spectrograph of ESO's Very Large Telescope (VLT). It was designed for ultra-high radial-velocity (RV) precision and extreme spectral fidelity with the aim of performing exoplanet research and fundamental astrophysical experiments with unprecedented precision and accuracy. It is able to observe with any

Presentamos un estudio arqueoastronómico de la denominada habitación 2 del poblado preibérico de San Cristóbal de Mazaleón (siglos VII-VI a.C.) y de varios túmulos de la necrópolis contemporánea asociada. La habitación 2 presenta una orientación ajustada a los ejes cardinales y un marcador del orto solar en fechas alrededor de los

Context. Umbral flashes are sudden brightenings commonly visible in the core of some chromospheric lines. Theoretical and numerical modeling suggests that they are produced by the propagation of shock waves. According to these models and early observations, umbral flashes are associated with upflows. However, recent studies have reported umbral

The torques exerted by stellar bars are expected to provoke the flow of cold gas within the disk, driving the secular evolution of the inner parts of the galaxy, as established in simulation models since the last century. To date, it remains a matter of debate why the distribution of ionized gas along bars and in the circumnuclear regions varies