As part of a major program to use isolated Local Group dwarf galaxies as near-field probes of cosmology, we have obtained deep images of the dwarf irregular galaxy Leo A with the Advanced Camera for Surveys aboard the Hubble Space Telescope. From these images we have constructed a color-magnitude diagram (CMD) reaching apparent [absolute]

Aims:We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the period-luminosity relation for its Mira variable. Methods: A combination of multi-epoch HST images and VLT integral field high-resolution spectroscopy is used to study the nebular

In the framework of a long-term program aimed at studying stellar populations in the Carina dSph galaxy, we present the photometric calibration of the two mosaic cameras adopted in this experiment, the MOSAICII CCD camera available at the 4-m CTIO Blanco telescope, and the WFI available at the 2.2-m ESO/MPI telescope. We discuss the data reduction

An accurate and traceable photometric calibration is becoming increasingly important for large telescopes if they are to reach their full potential. The scientific community of the Gran Telescopio Canarias (GTC) has recognized this and there are programmes underway to ensure that suitable calibration standards are in place. The aim is to extend the

Low-luminosity AGNs (LLAGNs), which make up the vast majority of the AGN population, may yield important clues into the origin and evolution of nuclear activity, constituting a perfect laboratory to investigate the connection between galaxies in which the central black holes are active and those in which they are quiescent. The precence of a

The AGN magnitude and surface brightness reported in Table 1, columns (2) and (3), were offset by band-dependent constants. The corrected values are given in the new version of Table 1 presented herein. The same photometric offsets were also used in Figure 2, which has incorrect values on the y-axis. The corrected Figure 2 is also shown herein. The