Spectroscopic and photometric observations are used to determine the distributions of gas and the kinematics in the central zones of a number of spirals. In...
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PublicaciónMass outflow and its consequences in the circumnuclear zones of galaxies
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PublicaciónMulti-level non-LTE calculations for very optically thick winds and photospheres under extreme NLTE conditions
A new technique to calculate multilevel non-LTE continuum formation in the UV of stellar winds and plane-parallel, static stellar atmospheres is developed using...
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PublicaciónNLTE analysis of high-resolution spectra of CSPN
Preliminary results of new high-resolution and S/N ratio spectra of central stars of planetary nebulae (CSPN) are presented. The atmospheric parameters (Teff...
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PublicaciónNLTE analysis of massive OB stars in open clusters
The paper presents a new method for deriving stellar masses and distances using the theory of radiatively driven winds as presented by Kudritzki et al. (1989)...
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PublicaciónObservations of outflow and its consequences in circum-nuclear zones of spirals
The radial hydrogen (H2 + HI) distribution in spirals takes two forms: with a density peak at the nucleus or with a circular 'hole' around it. Spectral and...
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PublicaciónOn the evolution of supernova remnants. II - Two-dimensional calculations of explosions inside pre-existing wind-driven bubbles
Supernova explosions within wind-driven bubbles are studied with 2D hydrodynamical calculations. Two different density distributions for the ejecta are...
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PublicaciónOn the evolution of supernova remnants. III - Off-centred supernova explosions in pre-existing wind-driven bubbles
It is shown that supernova explosions inside wind-driven cavities created by progenitors moving across the ambient medium result in a large diversity of remnant...
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PublicaciónOn the MG 2 and Fe 2 resonance lines in Herbig AE stars: Preliminary results
The IUE observed AB Aur, HD250550, and BD + 46 deg 3471 at high resolution in the range 2000 to 32000 A. The MgII resonance line profiles all show a P Cygni...
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PublicaciónOn the presence of two discs in the X-ray/Be binary A 0535 + 26/HDE 245770
The analysis of the efficiency of accretion in the X-ray binary system A 0535 + 26/HDE 245770 and of the specific angular momentum of the matter accreted during...