High-precision multi-band Hubble Space Telescope (HST) photometry reveals that the main sequence of the globular cluster NGC 6397 splits into two components, containing ~30% and ~70% of the stars. This double sequence is consistent with the idea that the cluster hosts two stellar populations: (1) a primordial population that has a composition

The MARVELS (Multi-object APO Radial Velocity Large-area Survey) project will monitor the radial velocities of 3300 stars. As a result, the project is likely to find rare objects, such as brown dwarf (BD) companions in the so-called brown dwarf desert. Two BD candidates in the desert have already been uncovered by the survey. Until recently

Context. The Themis collisional family is one of the largest and best established families in the main belt. Composed of primitive asteroids, there is evidence that water is likely present in a large fraction of its members, either in aqueously altered silicates or in water ice reservoirs. The study of the abundance of water in the outer asteroid

We present a deep I, Z photometric survey (I compl = 22 mag) covering a total area of 1.12 deg2 in the σ Orionis cluster. Using I, I - Z color-magnitude diagrams, we have selected 165 photometric candidates (I = 16-24 mag), which correspond to a mass interval from 0.11 down to 0.006 M &sun;. Using J-band photometry, we have found that 120 of 147

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We have started a project to search for symbiotic stars using the data from IPHAS, the Hα survey of the Northern Galactic plane. Candidates are selected from the IPHAS photometric catalogue based on their colors, combined with the information in the near-infrared from 2MASS. So far, follow-up spectroscopy allowed us to discover 14 new symbiotic