Our Galaxy seems to own, in addition with the oblate outer bulge (see poster of Picaud, Chereul and Robin) a longer and thiner in-plane bar (Lopez Carredoira, 2001). We compared stars counts and color-magnitude diagrams from the Besancon Model simulations (without this bar) with stars counts from observations at the Teide Observatory (near infrared

We have investigated the dynamical interaction of low- and intermediate-mass stars (from 1 to 5 Msolar) with their interstellar medium (ISM). In this first paper, we examine the structures generated by the stellar winds during the asymptotic giant branch (AGB) phase using a numerical code and the wind history predicted by stellar evolution. The

With a sample of 17 delta Scuti stars belonging to 5 young open clusters, we study correlations between fundamental parameters and the oscillation amplitude. The results published in a paper recently accepted by A and A show a significant correlation between the parameter i´(estimation of the angle of inclination of the star) and the oscillation

We present high-resolution Very Large Telescope/Ultraviolet Visual Echelle Spectrograph observations of 56 stars in the extended horizontal-branch (EHB) of the Galactic globular clusters NGC 1904, NGC 2808, NGC 6093, and NGC 7078. Our data reveal for the first time the presence in NGC 1904 of a sizable population of fast (vsini>=20 km s-1)

We present VR observations of QSO 2237+0305 conducted by the Gravitational Lensing International Time Project collaboration from 1999 October 1 to 2000 February 3. The observations were made with the 2.56 m Nordic Optical Telescope at Roque de los Muchachos Observatory, La Palma (Spain). The point-spread function (PSF) fitting method and an adapted

We use long-slit spectroscopy along the major axis of a sample of 23 nearby disk galaxies to study the kinematic properties of the ionized-gas component in their inner regions. For each galaxy, we derive the position-velocity diagram of the ionized gas from its emission lines. We discuss the variety of shapes observed in such position-velocity