Between 1999 February and 2000 April, the QUEST1 variability survey collected 69 drift scans of the same region of high Galactic latitude sky. The scans cover a...

QUEST1 constructed a 16-chip CCD camera to be used on the 1m Schmidt telescope at the Llano del Hato National Astronomical Observatory in Venezuela. Normally...

Context: In the last 8 Gyr of cosmic time the global star formation rate (SFR) has declined by roughly an order of magnitude, and most of this activity has been...

Multi-object spectroscopic observations of A697 were carried out at the TNG telescope in December 2003 during the program of proposal AOT8/CAT-G6. (1 data file)...

Spectroscopic redshifts for 132 galaxies in the central region of the galaxy cluster Abell 2219 are presented. For each galaxy equatorial coordinates, total R...

We present a set of face-on models of the radiative transfer of stellar light in exponential discs, taking into account absorption and multiple scattering...

We present the results on the optical morphology and structure of 25 low-luminosity radio galaxies. The radial dependence of parameters like the surface...

In this paper we report the results of simultaneous observations, using rapid continuous differential photometry, of the δ Scuti star 63 Her and of a normal...

Broadband UBVRI and narrowband H alpha and continuum images have been obtained for the Hickson compact group HCG 31 as part of an ongoing program devoted to the...