Spectroscopy of Hen 401 (IRAS 10178-5958) and WRA 751 (IRAS 11065-6026) reveal strong HI, HeI, FeII and forbidden emission lines. Images of Hen 401 reveal the...
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PublicationCircumstellar Material around the Proto-PNe IRAS 10178--5958 and IRAS 11065--6026
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PublicationCLÉS, Code Liégeois d'Évolution Stellaire
CLÉS is an evolution code recently developed to produce stellar models meeting the specific requirements of studies in asteroseismology. It offers the users a...
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PublicationClues to Substellar Formation: Rotation and the Low-Mass End of the Initial Mass Function
We have monitored S Ori 45, a young, low-mass (20 M j up) brown dwarf of the σ Orionis cluster (˜3 Myr, 352 pc), using optical and near-infrared filters. S Ori...
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PublicationCollisional enhancement of H i Balmer lines in photoionized nebulae
Collisional excitation of neutral hydrogen atoms can significantly increase the intensity of Balmer lines with respect to pure recombination. If this effect is...
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PublicationCompact Groups of Galaxies: Evolution of the Stellar Population
We present a study focusing on the nature of compact groups (CGs) through the study of their elliptical (E) galaxies. Parameters describing the internal...
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PublicationComparing peanut-shaped `bulges' to N-body simulations and orbital calculations
We present a near-infrared K n-band photometric study of edge-on galaxies with a box/ peanut-shaped `bulge'. The morphology of the galaxies is analysed using...
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PublicationCones of Ionizing Radiation in Active Galaxies - Probing the Central Engine
Highly ionized gas has been detected at large distances from the nucleus in several classes of active galaxies. There is evidence that photoionization by the...
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PublicationConfidence Limits of Evolutionary Synthesis Models
The probabilistic nature of the IMF in stellar systems implies that clusters of the same mass and age do not present the same unique values of their observed...
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PublicationCoordinated Observations of the Red Dwarf Flare Star EV Lac in 1993
Results of cooperative observations of the flare star EV Lac in September 1993 are presented. One of the about 30 optical flares detected was powerful enough to...