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Extrasolar Giant Planets: Masses and Luminosities from In-Situ Formation Theories
Their expected luminosities make young giant planets favorable for the first direct detection of an extrasolar planet. The giant planet formation...
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Fine Structure of the Red Clump in Local Group Galaxies
Some fine structures can nowadays be identified in the high-quality colour-magnitude diagrams (CMD) of Local Group galaxies. The clump of red giants,...
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Extra-Solar Planets with GAIA
GAIA, like Hipparcos, is a global astrometric mission which will survey the sky several times during the 5 years of its nominal lifetime. GAIA is...
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Searching for Planets with the Space Interferometry Mission
The Space Interferometry Mission (SIM) will be the first space-based long baseline Michelson interferometer designed for precision astrometry. It...
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The HARPS Project
To pursue a competitive programme in the domain of extra-solar planet search, ESO proposed to build HARPS (High-Accuracy Radial-velocity Planetary...
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Astrometry of Outer Solar System Bodies
Astrometry of faint and slowly moving objects in the outer solar system is considered to be the target for large telescopes, but in special cases...
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Simulations of Bias Effects in Kuiper Belt Surveys
Maximum likelihood methods are used to place limits on the allowed parameters of the Kuiper Belt. If an as yet unseen primordial Kuiper Belt exists...
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Limitations of Numerical Modelling of Kuiper Belt Object Dynamics
The investigation of the dynamics of KBOs is based on numerical orbital integrations on extremely long time scales due to orbital evolution of...
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The PICOCAM Project at Pic du Midi
Detection of minor bodies in the outer solar system depends of course on the telescope aperture but also on the field-of-view. Our idea was to use a...
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Physical Characteristics of Trans-Neptunian Objects and Centaurs
The available knowledge of the sizes, rotation periods, lightcurve amplitudes, colours and spectra of the Centaurs and Trans-Neptunian Objects is...
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The Power of Pencil-Beam Searches for Trans-Neptunian Science
In order to reach the faintest possible limiting magnitudes for moving objects, observations that shift and combine a large number of brief exposures...
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TNO Color Survey with the VLT: Pilot Observations with the Science Verification Camera
In the framework of the Science Verification of the first 8.2-m telescope of ESO’s Very Large Telescope, several TNOs were observed in order to...
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One of the Highest Redshift X-Ray Selected Clusters of Galaxies
An unusual double-lobed extended X-ray source with an angular size of 1.7 x 0.7 arcmin2 and an X-ray flux of 2...
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The Space Missions WAXS /WFXT and SWIFT: New Targets for the VLT
At OAB we were, during the year 1998, deeply involved in planning two important space missions for which very large ground based telescopes, VLT in...
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Improvement of Cepheids as Distance Indicators
The current status in the use of Cepheids as standard candles is reviewed. Sources of systematic error in HST-determined Cepheid distances are...
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Absolute Ages of Globular Clusters and the VLT
In the past two years, the ages derived for the oldest globular clusters have significantly decreased, and our confidence in them increased, due on...
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The Most Distant Galaxies
With the versatility and power of the VLT telescopes European astronomers are now set to take the study of the high redshift universe to new...
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Tidal Tails Around Galactic Globular Clusters
We present hereafter our study of the 2-D structures of the tidal tails associated with 20 galactic globular clusters, structures obtained by using...
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Abundance Determinations in Massive Blue Stars Within the Local Group
We present the current status of our knowledge on the photospheric abundances of massive blue stars (with spectral types O-A) in the Milky Way and...
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PRIMA - The VLTI Dual Feed System
The PRIMA (Phase Referenced Imaging and Micro-arcsec Astrometry) facility is the VLTI dual feed system adding a faint object imaging and an...