Deep broad-band BVRI photometry of a sample of 22 closely interacting isolated galaxy pairs is presented. The sample consists of pairs with a large variety of orbital geometries, but most of them are M51-type pairs: a small companion in the vicinity of a prominent two-armed spiral. This subsample will be later modelled in detail with N-body

We present the discovery of an object in the Pleiades open cluster, named Teide 2, with optical and infrared photometry that places it on the cluster sequence slightly below the expected substellar mass limit. We have obtained low- and high-resolution spectra that allow us to determine its spectral type (M6), radial velocity, and rotational

We present results from the imaging of a sample of 12 interacting galaxies for which we have cataloged all potential dwarf systems in the vicinity of these strongly interacting galaxies. After careful cleaning of the images and applying a restrictive S/N criterion we have identified, measured and cataloged all possible extended objects in each

IAUC 6865 available at Central Bureau for Astronomical Telegrams.

We discuss the nature of V Sagittae and T Pyxidis, two enigmatic blue variable stars commonly classed among the cataclysmic variables. These stars have bolometric luminosities in the range (1-50)x10^36 ergs s^-1, far exceeding that of any accretion-powered cataclysmic variable. They also show extremely blue colors (B-V=-0.3 and U-B=-1.3 after

We present VI CCD photometry of ~16,000 stars in a 7.2′ x 7.2′ field of the Local Group dwarf elliptical galaxy NGC 185. The resulting VI color-magnitude diagram reveals a dominant red giant branch population, an important number of luminous red stars located above the tip of the red giant branch, and a number of blue and yellow stars. Besides the